RE: external fuel pump

[Terry Rudd]

Good advise Kris.   Ppl, when you use one of those little Bosch relays (especially the plastic covered ones) for whatever purpose and you love your Datto, always make sure you have the primary fuse i.e. the largest capacity one in the line from the power source to Pin 30. If you don't fuse the primary power wire and you somehow get a dead short on that wire, the coil in the relay turns into a incendiary i.e. the relay will burn like a beauty. If you've got the thing stuck under the dash somewhere out of the way then you can imagine what happens. You can by all means use another smaller capacity fuse to the device being powered from Pin 87 and even in the sensing or switch wire to Pin 86 (lighting improvements are very often wired like this on a 1600, the smaller capacity fuses are actually the ones in the fuse box.)   For the VL HP pump, we use a 20 amp in the power line to Pin 30 and as the relay is usually mounted in the boot we use a 15 Amp fuses fairly close to the relay in the line from Pin 87 to the pump and also a 7.5 amp fuse in the sense line to Pin 86 normally close to the output from the ECU as this wire travels all the way through the interior loom - you don't want a dead short anywhere near your ECU. Also I recommend that if you use inline fuse holders around fuel and battery vapours you get bakelite ones in preference to metal ones, and never use those low cost plastic ones designed for 2 amp radio fuses, I've come across these things being used for high amp devices way too often.   regards Terry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Kristian Walsham Sent: Friday, 4 April 2003 2:26 PM To: [EMAIL PROTECTED] Subject: Re: external fuel pump Put the fuse as close as possible to were you are taking the power from. That way, the whole circuit is protected.   If you put it anywhere else, say after the relay and get a short between the power sorce and relay, the fuse won`t blow and you may end up with a fire.     Kris ----- Original Message ----- From: David Costello To: [EMAIL PROTECTED] Sent: Friday, April 04, 2003 1:02 AM Subject: Re: external fuel pump yeah thanks mark, I just asked before even thinking it through.  When I sat down and had a 2 minute think about what the relay has to do it was just common sense how to hook it up :( .... It was like one of those moment where the instructions for something are right under your nose and you're sitting there asking someone for the answer   Dave   PS. should I put the fuse between power and the relay, or the relay and the fuel pump? or doesn't it matter     ----- Original Message ----- From: mark krawczuk To: [EMAIL PROTECTED] Sent: Friday, April 04, 2003 12:00 AM Subject: Re: external fuel pump hi, you can use any of those square black bosch relays. they have a connection diagram on the  actual relay itself.. or the guy at the auto shop should help you.   run some decent size wire as well..   and a fuse. mark k ----- Original Message ----- From: David Costello To: [EMAIL PROTECTED] Sent: Thursday, April 03, 2003 2:37 PM Subject: external fuel pump guys I'm rigging up a VL Turbo external pump under the car can someone tell me what relay I have to use and a quick run down of how to wire up the relay (what each pin goes to)   Dave --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ --------------------------------------------------------------------- --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ --------------------------------------------------------------------- --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ --------------------------------------------------------------------- --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ --------------------------------------------------------------------- --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ ---------------------------------------------------------------------