Guys,
I have this fuel pump relay kit soldered and all on my car, have maintenance free type battery (AcDelco/Dry) and a new B16 alternator....now the wiring is doing its job, so the pump primes for 2 seconds (12v at the battery) once engine is cranked the battery is getting 14 some ( I believe its 14.2-14.7)...so that’s cool, BUT am getting 14 cause alternator is engaged, but once alternator disengages I get 12v, which effects on fuel pressure drop like 1-3 psi...well I didn’t find a solution for this? I must provide the pump with a constant voltage so AFRs don’t get effected and I know I can get the alternator engaged all the time and keep working continuously, but isn’t that gonna effect the life span of the alternator hence it will keep getting hot and hot? I even considered going with a bigger battery like a 16v and regulate it down to 14.7 something, but I don’t know if I should do it or not? Would you guys consider a wet battery over a dry battery if you are using a fuel pump relay wiring? And yea am using crome and this test was done with the ELD disabled, should I enable ELD in this case or leave it disabled? I have noticed many people on pgmfi.org disabling ELD for some reason I can’t remember what it was?

Am really concerned on how to solve this issue since these voltage variations (12 - 14.7) do effect fuel pressure which result in varying AFRs!

Any recommendation’s here?

 

if the eld is turned off your alt. should do 14v all the time unless at idle you have alot of accessories running.

 

ELD is turned off, but i notice some voltage drop when the fan goes on...is it a wise thing to cut ALT C wire to ensure alternator working all the time....would it effect on its life span?

 

bump for more advice