Re: [DOG mailing list] H 36 electric fuel pump

[Jarek Steliga]

Thank you all again.

Regards
Jarek



On Tue, 12 Nov 2019 at 13:02, Ric Sutton  wrote:

> Hi jarek
>
> Yep you are correct. Mine is not the same as the diagram in the
> maintenance manual.
>
>
>
> *From:* dog@lists.riverland.net.au [mailto:dog@lists.riverland.net.au] *On
> Behalf Of *Jarek Steliga
> *Sent:* Monday, 11 November 2019 11:00 PM
> *To:* Laurie Hoffman via dog
> *Subject:* Re: [DOG mailing list] H 36 electric fuel pump
>
>
>
> Ric,
>
>
>
> Thank you. Does this mean that your fuel valve is downstream side of your
> electric fuel pump and therefore not according to the diagram on page 13 of
> this document?
> http://support.diamond-air.at/fileadmin/uploads/files/after_sales_support/H36_Dimona/Airplane_Maintenance_Manual/Basic_Manual/H36-AMM-USA-1988-05-25-r0.pdf
>  I believe this is how it is in my Dimona unless the fuel hose is somehow
> meandering from the shut off valve back to the vicinity of the fuel tank
> where I know for a fact my electric pump is.
>
>
>
> Regards
>
> Jarek
>
>
>
> On Mon, 11 Nov 2019 at 13:34, Ric Sutton  wrote:
>
> i should add that the ticking noise dies off as the system is pressurised.
> but if yours ain t ticking then there maybe some other gremlin at play.
>
>
>
> others on here may know better and i'd be happy to hear about it but yes i
> do believe it is a backup system.
>
>
>
> do you have an inline filter as well?
>
>
>
> i have found that buying a plane of this age with this many owners and
> maintenance regimes, its hard to know what is standard and whats not.
>
>
>
> i have an inline (automotive fuel injection- off a toyota camry i believe)
> filter fitted directly to the downstream side of my  electric fuel pump
> (between the fuel pump and fuel valve)
> --
>
> *From:* dog@lists.riverland.net.au  on behalf
> of Jarek Steliga 
> *Sent:* Monday, November 11, 2019 12:01 PM
> *To:* Laurie Hoffman via dog 
> *Subject:* [DOG mailing list] H 36 electric fuel pump
>
>
>
>
>
>
>
> Hi,
>
>
>
> How to make sure the pump functions properly? Does it produce some audible
> buzz sound when switched on? When I disconnected the fuel hose at the
> carburetor and switched the pump on, no fuel flowed.
>
>
>
> Is this pump just a back up in case the main engine driven pump fails
> during take off / landing?
>
>
>
> What is the electrical pump's location relative to the shut off valve? As
> per diagram between the fuel shut off valve and the carb?
>
>
>
> Tank you in anticipation
>
>
>
> Regards
>
> Jarek
>
>
>
>
>
>

RE: [DOG mailing list] H 36 electric fuel pump

[Ric Sutton]

Hi jarek
Yep you are correct. Mine is not the same as the diagram in the maintenance 
manual.

From: dog@lists.riverland.net.au [mailto:dog@lists.riverland.net.au] On Behalf 
Of Jarek Steliga
Sent: Monday, 11 November 2019 11:00 PM
To: Laurie Hoffman via dog
Subject: Re: [DOG mailing list] H 36 electric fuel pump

Ric,

Thank you. Does this mean that your fuel valve is downstream side of your 
electric fuel pump and therefore not according to the diagram on page 13 of 
this document? 
http://support.diamond-air.at/fileadmin/uploads/files/after_sales_support/H36_Dimona/Airplane_Maintenance_Manual/Basic_Manual/H36-AMM-USA-1988-05-25-r0.pdf
   I believe this is how it is in my Dimona unless the fuel hose is somehow 
meandering from the shut off valve back to the vicinity of the fuel tank where 
I know for a fact my electric pump is.

Regards
Jarek

On Mon, 11 Nov 2019 at 13:34, Ric Sutton 
mailto:ricinthel...@outlook.com>> wrote:
i should add that the ticking noise dies off as the system is pressurised. but 
if yours ain t ticking then there maybe some other gremlin at play.

others on here may know better and i'd be happy to hear about it but yes i do 
believe it is a backup system.

do you have an inline filter as well?

i have found that buying a plane of this age with this many owners and 
maintenance regimes, its hard to know what is standard and whats not.

i have an inline (automotive fuel injection- off a toyota camry i believe) 
filter fitted directly to the downstream side of my  electric fuel pump 
(between the fuel pump and fuel valve)

From: dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au> 
mailto:dog@lists.riverland.net.au>> on behalf of 
Jarek Steliga mailto:jarekstel...@gmail.com>>
Sent: Monday, November 11, 2019 12:01 PM
To: Laurie Hoffman via dog 
mailto:dog@lists.riverland.net.au>>
Subject: [DOG mailing list] H 36 electric fuel pump



Hi,

How to make sure the pump functions properly? Does it produce some audible buzz 
sound when switched on? When I disconnected the fuel hose at the carburetor and 
switched the pump on, no fuel flowed.

Is this pump just a back up in case the main engine driven pump fails during 
take off / landing?

What is the electrical pump's location relative to the shut off valve? As per 
diagram between the fuel shut off valve and the carb?

Tank you in anticipation

Regards
Jarek

RE: [DOG mailing list] H 36 electric fuel pump

[Ian Williams]

I may be corrected here, but Service Bulletin SB11E relates the changing  the 
early electric pump in the engine bay design  It refers to Mod instruction Nr 3 
 ((Arbritsanweisung)   (Also Work instruction 27 which seems the same) 

That instruction is a detailed description and pictures of the fuel pump 
installation and the routing of the fuel lines.

I had to carry out this mod  (S/no 3537)  .. But presumably was embodied in 
later serial no’s.   … and should have been updated in the Maintenance manual

When I had the final (NZCAA) inspection, the inspector did pick up the 1500 hr 
limit on the Hardy fuel pump.  Was replaced by a new one from the factory.   
However the “electronic “ ones have a much longer life.But they don’t seem 
to stop “ticking” like the old Hardy ones .   Just keep running.

 

From: dog@lists.riverland.net.au 
Sent: Tuesday, 12 November 2019 8:45 p.m.
To: dog@lists.riverland.net.au
Subject: Re: [DOG mailing list] H 36 electric fuel pump

 

It's really important to check for fuel leaks prior the first flight of the day 
and any others on every flight. In addition to what Greg mentioned about causes 
for lack of fuel line, pressurisation, the carby floats can and do stick 
causing flooding into (and even out of) the catch trays under each carb.

 

It was a good move by GFA to require that the electric pump is tested during 
the DI AND during subsequent pre boardng checks. 

(Included in the F of the ABCDEF for the Aussie operators).

 

Others may want to ensure this is done as part of their own checks where 
appropriate.

 

Laurie

Sent from Yahoo7 Mail on Android 
<https://go.onelink.me/107872968?pid=InProduct=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers_wl=ym_sub1=Internal_sub2=Global_YGrowth_sub3=EmailSignature>
 

 

On Tue., 12 Nov. 2019 at 2:47 pm, Greg Wilson

mailto:g...@gregwilson.id.au> > wrote:

The electric pump is under and in front of the fuel tank behind the seats, 
before the shut-off valve. The purpose of the electric fuel pump is to prime 
the fuel lines as well as a backup on take-off.

It's good practice to turn the main switch and fuel pump on while doing the DI. 
You should hear it click until the line is primed. If it doesn't stop clicking, 
you have a fuel leak or a faulty needle and seat in one of the carbys.

You can also disconnect the fuel line at the mechanical pump and measure how 
long the electric pump takes to fill a one litre bottle. The minimum flow rate 
is listed in the maintenance manual. If there's crap in the tank or wrong type 
of fuel valve has been fitted (NOT ball valve type) it won't supply the minimum 
amount.

Cheers,

Greg.

 

 


Greg Wilson



 

 

 On Mon, 11 Nov 2019 22:01:32 +1100 Jarek Steliga mailto:jarekstel...@gmail.com> > wrote 

 

 

 

Hi,

 

How to make sure the pump functions properly? Does it produce some audible buzz 
sound when switched on? When I disconnected the fuel hose at the carburetor and 
switched the pump on, no fuel flowed. 

 

Is this pump just a back up in case the main engine driven pump fails during 
take off / landing?

 

What is the electrical pump's location relative to the shut off valve? As per 
diagram between the fuel shut off valve and the carb? 

 

Tank you in anticipation

 

Regards

Jarek

 

 

 

 

Re: [DOG mailing list] H 36 electric fuel pump

[Laurie Hoffman via dog]

It's really important to check for fuel leaks prior the first flight of the day 
and any others on every flight. In addition to what Greg mentioned about causes 
for lack of fuel line, pressurisation, the carby floats can and do stick 
causing flooding into (and even out of) the catch trays under each carb.
It was a good move by GFA to require that the electric pump is tested during 
the DI AND during subsequent pre boardng checks. (Included in the F of the 
ABCDEF for the Aussie operators).
Others may want to ensure this is done as part of their own checks where 
appropriate.
Laurie

Sent from Yahoo7 Mail on Android 
 
  On Tue., 12 Nov. 2019 at 2:47 pm, Greg Wilson wrote:   
The electric pump is under and in front of the fuel tank behind the seats, 
before the shut-off valve. The purpose of the electric fuel pump is to prime 
the fuel lines as well as a backup on take-off.

It's good practice to turn the main switch and fuel pump on while doing the DI. 
You should hear it click until the line is primed. If it doesn't stop clicking, 
you have a fuel leak or a faulty needle and seat in one of the carbys.

You can also disconnect the fuel line at the mechanical pump and measure how 
long the electric pump takes to fill a one litre bottle. The minimum flow rate 
is listed in the maintenance manual. If there's crap in the tank or wrong type 
of fuel valve has been fitted (NOT ball valve type) it won't supply the minimum 
amount.

Cheers,

Greg.



Greg Wilson




 On Mon, 11 Nov 2019 22:01:32 +1100 Jarek Steliga  
wrote 




Hi,

How to make sure the pump functions properly? Does it produce some audible buzz 
sound when switched on? When I disconnected the fuel hose at the carburetor and 
switched the pump on, no fuel flowed. 

Is this pump just a back up in case the main engine driven pump fails during 
take off / landing?

What is the electrical pump's location relative to the shut off valve? As per 
diagram between the fuel shut off valve and the carb? 

Tank you in anticipation

Regards
Jarek





  

Re: [DOG mailing list] H 36 electric fuel pump

[Greg Wilson]

The electric pump is under and in front of the fuel tank behind the seats, 
before the shut-off valve. The purpose of the electric fuel pump is to prime 
the fuel lines as well as a backup on take-off.

It's good practice to turn the main switch and fuel pump on while doing the DI. 
You should hear it click until the line is primed. If it doesn't stop clicking, 
you have a fuel leak or a faulty needle and seat in one of the carbys.

You can also disconnect the fuel line at the mechanical pump and measure how 
long the electric pump takes to fill a one litre bottle. The minimum flow rate 
is listed in the maintenance manual. If there's crap in the tank or wrong type 
of fuel valve has been fitted (NOT ball valve type) it won't supply the minimum 
amount.

Cheers,

Greg.




Greg Wilson





 On Mon, 11 Nov 2019 22:01:32 +1100 Jarek Steliga 
 wrote 





Hi,



How to make sure the pump functions properly? Does it produce some audible buzz 
sound when switched on? When I disconnected the fuel hose at the carburetor and 
switched the pump on, no fuel flowed. 



Is this pump just a back up in case the main engine driven pump fails during 
take off / landing?



What is the electrical pump's location relative to the shut off valve? As per 
diagram between the fuel shut off valve and the carb? 



Tank you in anticipation



Regards

Jarek

Re: [DOG mailing list] H 36 electric fuel pump

[Martyn]

Hi Jarek
I had the same issue.  The electric fuel pump clicked away, but there 
wasn't enough pressure to push fuel up to the carburettors. I dismantled 
the pump and found the electrical contacts badly worn, and not worth 
trying to repair.  Also, the pump has a life of only 1500 hours, so I 
decided to replace it.  Fortunately I could purchase a replacement Hardi 
pump directly from the manufacturer in Germany with no hassle.  Now the 
pump pressure is great and plenty of fuel gets to the carbs.
Incidentally, I also found that although the fuel hoses had been 
replaced as scheduled the intake screen at the fuel pump had not been 
cleaned, and had what looked like glass fibres in it - despite my Dimona 
having  been changed to an aluminium fuel tank.
The electric fuel pump is not per your diagram.  There is a later mod to 
the fuel system.  The electric pump is installed underneath and just 
forward of the fuel tank - very awkward to get at - and is plumbed in 
between the tank and the shut-off valve.  This means there are two fuel 
pumps in series - electric first, then the shut-off valve, then the 
engine-driven pump.  As long as one or both pumps are operating fuel 
will get to the engine.

Hope this helps.
Kind regards
Martyn

On 12/11/19 12:01 AM, Jarek Steliga wrote:



Hi,

How to make sure the pump functions properly? Does it produce some 
audible buzz sound when switched on? When I disconnected the fuel hose 
at the carburetor and switched the pump on, no fuel flowed.


Is this pump just a back up in case the main engine driven pump fails 
during take off / landing?


What is the electrical pump's location relative to the shut off valve? 
As per diagram between the fuel shut off valve and the carb?


Tank you in anticipation

Regards
Jarek

Re: [DOG mailing list] H 36 electric fuel pump

[Jarek Steliga]

Ric,

Thank you. Does this mean that your fuel valve is downstream side of your
electric fuel pump and therefore not according to the diagram on page 13 of
this document?
http://support.diamond-air.at/fileadmin/uploads/files/after_sales_support/H36_Dimona/Airplane_Maintenance_Manual/Basic_Manual/H36-AMM-USA-1988-05-25-r0.pdf
 I believe this is how it is in my Dimona unless the fuel hose is somehow
meandering from the shut off valve back to the vicinity of the fuel tank
where I know for a fact my electric pump is.

Regards
Jarek

On Mon, 11 Nov 2019 at 13:34, Ric Sutton  wrote:

> i should add that the ticking noise dies off as the system is pressurised.
> but if yours ain t ticking then there maybe some other gremlin at play.
>
> others on here may know better and i'd be happy to hear about it but yes i
> do believe it is a backup system.
>
> do you have an inline filter as well?
>
> i have found that buying a plane of this age with this many owners and
> maintenance regimes, its hard to know what is standard and whats not.
>
> i have an inline (automotive fuel injection- off a toyota camry i believe)
> filter fitted directly to the downstream side of my  electric fuel pump
> (between the fuel pump and fuel valve)
> --
> *From:* dog@lists.riverland.net.au  on behalf
> of Jarek Steliga 
> *Sent:* Monday, November 11, 2019 12:01 PM
> *To:* Laurie Hoffman via dog 
> *Subject:* [DOG mailing list] H 36 electric fuel pump
>
>
>
> Hi,
>
> How to make sure the pump functions properly? Does it produce some audible
> buzz sound when switched on? When I disconnected the fuel hose at the
> carburetor and switched the pump on, no fuel flowed.
>
> Is this pump just a back up in case the main engine driven pump fails
> during take off / landing?
>
> What is the electrical pump's location relative to the shut off valve? As
> per diagram between the fuel shut off valve and the carb?
>
> Tank you in anticipation
>
> Regards
> Jarek
>
>
>

Re: [DOG mailing list] H 36 electric fuel pump

[Ric Sutton]

i should add that the ticking noise dies off as the system is pressurised. but 
if yours ain t ticking then there maybe some other gremlin at play.

others on here may know better and i'd be happy to hear about it but yes i do 
believe it is a backup system.

do you have an inline filter as well?

i have found that buying a plane of this age with this many owners and 
maintenance regimes, its hard to know what is standard and whats not.

i have an inline (automotive fuel injection- off a toyota camry i believe) 
filter fitted directly to the downstream side of my  electric fuel pump 
(between the fuel pump and fuel valve)

From: dog@lists.riverland.net.au  on behalf of 
Jarek Steliga 
Sent: Monday, November 11, 2019 12:01 PM
To: Laurie Hoffman via dog 
Subject: [DOG mailing list] H 36 electric fuel pump



Hi,

How to make sure the pump functions properly? Does it produce some audible buzz 
sound when switched on? When I disconnected the fuel hose at the carburetor and 
switched the pump on, no fuel flowed.

Is this pump just a back up in case the main engine driven pump fails during 
take off / landing?

What is the electrical pump's location relative to the shut off valve? As per 
diagram between the fuel shut off valve and the carb?

Tank you in anticipation

Regards
Jarek

Re: [DOG mailing list] H 36 electric fuel pump

[Ric Sutton]

hi jarek
if your electric fuel pump is fitted as per standard it should be between the 
fuel tank and the fuel valve. there should definitely be fuel coming out (if 
the fuel vale is open) my fuel pump (which i believe to be standard) makes a 
TIC tic TIC tic TIC tic noise ticking every 0.5 seconds (or so). try 
disconnecting the fuel line on the inlet side of the mechanical fuel pump to 
see if the fuel has made it that far. maybe the finger filter in the bottom of 
the tank is blocked. mine was fairly pegged with silicone at one stage (various 
sources judging by the various colours found). hope this helps

From: dog@lists.riverland.net.au  on behalf of 
Jarek Steliga 
Sent: Monday, November 11, 2019 12:01 PM
To: Laurie Hoffman via dog 
Subject: [DOG mailing list] H 36 electric fuel pump



Hi,

How to make sure the pump functions properly? Does it produce some audible buzz 
sound when switched on? When I disconnected the fuel hose at the carburetor and 
switched the pump on, no fuel flowed.

Is this pump just a back up in case the main engine driven pump fails during 
take off / landing?

What is the electrical pump's location relative to the shut off valve? As per 
diagram between the fuel shut off valve and the carb?

Tank you in anticipation

Regards
Jarek