Need some help here please.
Thread Starter
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Joined: Aug 2012
Posts: 86
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Need some help here please.
ok, so the other day i stopped for fuel, car was running great all day. but after i stopped and fueled up my car would not start. once i got her home (towed) i did some troubleshooting, first thing i did was check for spark. i was good there. 2nd thing i did was check for voltage at the rear harness that connects to fuel pump pigtail. i am getting 10.5 volts there and my battery is at a constant 12.75. next i supplied 12v to terminal G of my diagnostic port and the pump kicked in right away. i have also looked at the relay. i compared it to a brand new one and everything SEEMS ok. my next plan is to run a wire to terminal G from battery power with an inline switch and see if it works. i really do not know where else to look. any info would be greatly appreciated. Thanks.
Jay
Jay
Race Director
Joined: Aug 2007
Posts: 11,889
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From: Whitefish Falls Ontario
St. Jude Donor '08-'09
When you put 12v to G would it start? When you first try to start it do you hear the pump come on for about 2 seconds? If you don't hear the pump for the 2 seconds check the relay, contacts may be bad.. LOL 
Racer
Joined: Sep 2010
Posts: 325
Likes: 7
From: Princeton Jct. New Jersey
Did you check the oil pressure switch and oil level? I believe the ECM needs a positive pressure permissive to trigger the fuel pump relay. You may have a loose OPS connector or broken wire.
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Using terminal G puts power to the contacts on the pump relay anyway so you are not bypassing any possibly bad wiring
Link to the ECM is because the ECM monitors the pump voltage and can make adjustments if the voltage to pump varies ( pump volume / pressure changes )
Thread Starter
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Joined: Aug 2012
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sorry for the late update, was without internet for a while. so i did what i listed above and everything worked great. i am still unsure for the original root cause, but i am ok with a "hidden" fuel pump switch now...
thanks for all the input as well.
thanks for all the input as well.