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Old 04-18-2013, 08:28 AM
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Factory fuel pump thread

Ok so originally, I had the stock pump with the blue spring. Running various high hp tunes fuel pressure never dropped below 40-45 psi @ WOT. Then I upgraded to casserly 155 50's, running looney wild. Now the fuel pressure dropped to below 30 psi quite easily so obviosly had to back out of the throttle. So I decided to upgrade to a new factory pump, this helped it stay above 40 for longer but still would taper off steadily. Then I added the fass 95 gph 15psi "pusher" pump, and now to my delight it'll hold 50psi @ WOT.

I will add that the fuel pressure at idle with the spring was around 68, with the new pump up to 70-71. and now with the fass idles @ 75 psi, this is my only concern...

Thoughts on the idle pressure?. I did wire the pump through the upfitter so I can shut it down and the pressure will stay at 70 pulling throught the fass pump.

All readings taken off edge insight plumbed into the test port.

Also since someone will ask. EGT's with the injectors, gogo manifold, p-max, banks IC, and batmo. Will hit 1650-1700 on a 0-60 run with barely visible smoke.

These injectors seem to flow pretty good

Guess I might have to look into a stage billet stg 1 or 2

Also noticed that with the addition of only the fass I gained boost in OD under load from 32 to 34 psi...

One more thing the boost is also read off the insight, plumbed into the intake elbow. Reading off the map it'll read almost identical. So im not sure if my truck is special cause some say you wont get a good reading off of the map sensor over 30 psi. Thats why I installed the insight sensor
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