Re: automatically switch off electric fuel pump when engine not running

[Rob P]

Hi Jeff, here's some info from Terry that provides a good option. I dug this one out of my old Ozdat archives. I don't know if the diagram will be visible to you, nor the Holley website address.   Cheers, Rob P           -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Kristian Walsham Sent: Sunday, 16 March 2003 6:19 PM To: membersozdat@datascribe.com.au Subject: fuel pump supply Hi All,         I have an Bosch alternator off a Bluebird in my 1600 and was wondering if the "black plastic" terminal marked "+" is/can be used to supply an electric fuel pump also from a Bluebird and what size fuse should i use? [Terry Rudd] Yes it can be used to power a relay, as it's the same wire that connects onto the main battery lug on the starter motor, also it branches off in the loom to the fuse box (big wire with connector in front of the fuse box.) I don't use a Bluey pump any more as I found them a tad unreliable for race conditions but I would think a 10 or 15 amp fuse on the battery feed to the relay suits most LP pumps. I use a Denso LP pump of a Mazda RX7 EFI and it draws around 5 amps, I imagine a Bluey pump is rated similarly. If you mount the pump behind the stock battery position The closest ignition sense source is found at position 4 (white/blue wire) on the old 6 pin Hitachi external voltage regulator plug that was disconnected to get the Bosch alternator running.   Fuel Pump.   Wire the relay thus: Pin 30 - fused power from battery supply  (4 mm) Pin 85 - Earth (2 mm) Pin 86 - Ignition (2 mm) Pin 87 - Pump (+) (4 mm shielded) Pump (-ve) to Earth (2 mm)   * By shielded I mean run it inside that black stuff that's used on modern day cars that protects wires from insulation damage especially if the pump is located in or around the boot for EFI applications i.e. surge tank feed.   [Terry Rudd]  You can control the relay on/off operation a number of ways. 1. Electronic device that senses the coil is pulsing i.e. engine running etc and controls sense (ignition) and/or earth function to the relay. Will control relay after Ign ON but you don't start as well as stall.   2. Gas switch which does the same thing but usually has no control over timings etc i.e. they turn the pump off 2 seconds after stall is detected but will run continuously after Ign ON before start.   3. Oil pressure switch (Holley) Here's a diagram off the Holley web site - pretty nifty and been used on many an EFI conversion as it's a mandatory safety item in some places and there wasn't many alternative around 10 years ago. I've fitted a few of these on a 1600 and they work well, no timings like the electronic types around now and these could be more expensive as they're made in the USA. They also need a 1/8" BSP (British Standard Pipe) adapter for L and from memory FJ series.   Oil Pressure Safety Switch It's always a good idea to place a safety switch in the circuit when installing an electric fuel pump. Holley has one available under P/N 12-810. This switch will ensure that the electric pump will not work unless the engine has oil pressure. It will prevent the pump from running in a situation where the motor may stall with the ignition ON. Wiring the switch through the starter solenoid circuit energizes the pump on engine start-up. After the engine is running the switch continues to provide power to the pump as long as there is oil pressure to keep the switch turned on.     Does this terminal only supply power when the car is running or is it live all the time?  I don`t have a tester to tell. [Terry Rudd] It's live all the time as it's connected to the positive battery lead at the starter motor.    Also does this pump flow more than the mechanical type? [Terry Rudd] Electric pumps usually have significantly more flow but lower pressure than L series mechanical pumps - they suit webers to a tee. They need to be insulated well from the body mountings as they tend to be noisy.     Thanks,             Kris. ----- Original Message ----- From: Jeff To: [EMAIL PROTECTED] Com. Au Sent: Tuesday, January 25, 2005 10:00 AM Subject: automatically switch off electric fuel pump when engine not running CAMS is bringing in a rule this year where all cars running a fuel pump have to have a system where the fuel pump stops pumping fuel when the engine is not running.  I think the test will basicly be you stick the car in first, let the clutch out with you foot on the brake so that the engine stalls.  The fuel must stop pumping within a short time ie 30 seconds.   Anyone got any ideas for a simple way to do this on a carburetted engine ? (i think most fuel injection systems have this built in ?)   ta jeff --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to membersozdat@datascribe.com.au 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/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to membersozdat@datascribe.com.au 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/membersozdat@datascribe.com.au/ ---------------------------------------------------------------------