LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Pressure Bleedoff?

Old Jan 5, 2009 | 08:57 PM
  #1  
MTBSully's Avatar
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From: Central Mass and NH
Pressure Bleedoff?

Well guys i don't know what i did, but it fixed my fuel pressure issue. I think it was that the main feed line on the pump was loose or something. However it also could have been something electrical but im not sure. Anyways, usually the car takes forever to start, and this time it fired right up. This surprised me, so i went to check my fuel pressure guage and i had 60psi!! So i shut the car off, got some tools, started it back up and adjusted it to 43.5psi. Car runs really well right now. I thought it was a stock pump when i pulled it out too, but now that its running right, its MUCH louder than any other stock pump i have heard (never was this loud before). Sounds exactly like the walbro 255 my buddy has in his vr4, so i think it is. Anyways, im pumped. Car is running good for the time being.

My question is, after shutting the car off, the pressure has usually bled off to about 20psi or so after 3-4 minutes. Is this normal with an aftermarket pump? I had heard that they don't hold pressure after shutoff like the stocker does. Any opinions here? Thanks guys

I have a new holley AFPR on there right now.
Old Jan 5, 2009 | 09:00 PM
  #2  
RamAir95TA's Avatar
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From: Woodstown, NJ
A small amount of bleed-off when you turn the car off over a course of a few minutes is pretty normal.
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