There will be a schrader valve somewhere on the fuel rail. ( like a
tire valve) if you press that you should get fuel under pressure.
With experience you can make a good guess as to how much pressure
your getting, but all you really need to know at this point is that
your getting fuel. Try and start the truck, but don't let it actually
crank more than once or twice. then press the valve, you should have
40ish psi so keep your eyes out of the way. If you get nothing your
pump isn't working... diagnose that as needed. It needs to be in a
bath of fuel, it needs electricity, and ground, and last it needs to
be able to spin. Clogged lines etc are very unlikely.
Start by confirming the fuel level in the tank. Do NOT depend on the
gauge. Knocking on tank or adding $5 your call.
Just re-read your post... is there old gas, + a little new gas +
seafoam in the tank? If there is only a single gallon of new gas in
an S10 and no old gas, your out of gas, if there is lots of old gas
it could be rusted / varnished tight.
Put a test light on the leads to the pump, have someone watch the
light while you turn the key from off to run, wait for a count of 15,
you should get power during this, then try and crank. If you get no
light during this test check the obvious ie mouse eaten wires etc.
After that you need a Chevy guy I have no idea what or how chevy
supplies power to their pumps. If you get light but no gas, check the
ground. clip your test light to batt pos, then probe the ground wire
and go through the key procedure again (some manufacturers switch the
ground) If you don't get ground same thing look for the obvious then
find a chevy guy.
If you have power AND ground... nothing good to say here. You're
going to have to drop the tank and get the pump in your hands.
If you get to that point shoot me another e-mail and I'll give you
more advice. Most of which you're not going to like much lol.
More re-reading... Your filter is easy, It'll have flange nuts at
each end, use 2 wrenches and undo them, remove filter, blow through
filter... You love your truck right ;o) it should have no more
restriction than a McDonalds straw. If it's clogged you can use it as
a tester by drilling or punching a hole though the filter media and
reinstalling. I have a straight piece of tube with fittings for my
fords just for this. Don't run it this way for longer than a few min.
If it's that clogged it was for a reason. Expect to go through 2 this
year if that turns out to be the problem. After that you should be good.
At 06:22 PM 8/20/2011, you wrote:
You could check all the fuses. One may have decided to go. You could
pick up a fuel pressure tester online for about $30 and it'll tell
you what kind of pressure it's generating. If it had a mechanical
fuel pump (which it doesn't) the lines might just be dried up, and
the pump lost it's prime. No, maybe that's a stupid idea...
Can you hear the pump come on when you turn the key? It's a very
faint high pitched hissing sort of sound. If not, you could try to
check for voltage at the sending unit (pump).
On Aug 20, 2011, at 6:00 PM, NghthwkLvr (NL) wrote:
> Thanks Allen...
>
> Before I disconnect the inlet/outlet lines again, I was wondering if
> there was another way to check for fuel flow. As for the fuel pump, I
> think i had just had it replaced before I stopped running it. I have
> noticed that there is very little to no smell of gas. Also, what about
> a thorough cleaning of the fuel injectors?
>
> On Aug 20, 2:02 pm, "Allen Thomas" <[email protected]> wrote:
>> Could be the fuel pump, clogged pickup, rusted through lines,
etc. Disconnect from the TB and ensure you have flow to it. If not
then work your way back to the tank. Otherwise clean the TB again.
>> Sent via BlackBerry by AT&T
>>
>>
>>
>> -----Original Message-----
>> From: "NghthwkLvr (NL)" <[email protected]>
>>
>> Sender: [email protected]
>> Date: Sat, 20 Aug 2011 11:14:40
>> To: Nighthawk Motorcycle Lovers!<[email protected]>
>> Reply-To: [email protected]
>> Subject: [Nighthawk Lovers] OT - 91 GMC Sonoma PU won't stay on...
>>
>> Hey Guys!
>>
>> Haven't posted here in a while but I am always lurking around in the
>> shadows, love this group and the interesting discussions.
>>
>> Let me apologize beforehand for this OT post...but...
>>
>> I have a 91 GMC Sonoma PU that I want to get running and cleaned up to
>> give my son for his 18th birthday and senior year. It has been
>> sitting around doing nothing since 2007 when I got my new to me PU. In
>> Sept 08, I started it, drove it down the street, and filled up the
>> tank. Then I parked it, and haven't moved it since. Well, earlier this
>> summer, I started tinkering around with it to get it running
>> again...bought a new battery and all, but it hasn't started. So I
>> proceeded to clean out the gas lines and TBI/Fuel injector assembly. I
>> put about a gallon of new gas into the tank and a couple of ounces
>> into the TB....and now here is my problem: it only starts and stays on
>> until the fuel in the TB runs out...I even put a little SeaFoam into
>> the TB and it does the same thing.
>>
>> I'm thinking, I need to change the fuel filter, which is under the bed
>> on the drivers side, BUT, was wondering if maybe there is something
>> else I should try before I go through all that trouble. (Changing the
>> fuel filter was one of those things that I'd just rather pay to have
>> done than do it myself).
>>
>> Anyway, I have the Chilton Manual for this truck that I'm going to go
>> review after I post this, but I just wanted to see if anyone here had
>> any suggestions.
>>
>> Thanks for any suggestions and again, I apologize for the OT post.
>>
>> -NghthwkLvr-
>>
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>> - Show quoted text -
>
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Pat Patterson
Abbotsford, BC, Canada
2001 PT Cruiser
83 450 Honda Nighthawk
78 F350 460/C6 on propane
71 Bronco 302/C4/D20 D44/9"
Some people try to turn back their odometers. Not me, I want people
to know "why" I look this way. I've traveled a long way and some of
the roads weren't paved.
"If you can't take the heat, don't tickle the dragon."
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