cheekymonkey Posted May 5, 2008 Share Posted May 5, 2008 Right I have two Supra's now Supra1 is my baby with the Apexi PowerFC. When I turn the ignition on (without starting) I can hear the fuel pump prime for perhaps 3 or 4 seconds. Car will then start after 2 seconds of cranking. Perfect. Supra2 is my project car. It has a Motec ECU but as far as I can tell all the other fuel components are stock. On this one, the pump primes when I turn the key, but it doesn't stop priming, it just carries on and on. Car cranks for at least twice as long as Supra1 before starting, but once it's started all seems fine. Now, I would guess that a lack of fuel pressure would cause this, but apart from that the car drives and boosts fine - so what gives? Quote Link to comment Share on other sites More sharing options...
Steve Posted May 6, 2008 Share Posted May 6, 2008 Someone may have done the 12v fuel pump mod, so the pump will run flat out all the time. http://www.mkiv.com/techarticles/12v_mod/12v_mod.htm Quote Link to comment Share on other sites More sharing options...
cheekymonkey Posted May 6, 2008 Author Share Posted May 6, 2008 Would that affect priming/cranking though? If anything I would guess that would increase the FP not cause problems Quote Link to comment Share on other sites More sharing options...
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