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TBI fuel pressure, how are you getting 15 + PSI

Discussion in 'The Garage' started by tch777, Oct 12, 2005.

  1. tch777

    tch777 1/2 ton status

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    I put in an adjustable Fuel pressure regulator and I can only get 14.5 PSI out of the GM stock pump. I want to vacuum reference my fuel pressure but to do that I have to get up to 18 to 20 PSI.

    What pump or pumps are you all using to get these higher PSI.
    I tried searching could not find what I was looking for.


    Thanks
    Tim
     
  2. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    As far as I know and from what I've experienced on my truck, anything over 14-15 psi and the injecters can't cope anyway. Mine ran way rich when I had it at 15 psi. You need to lengthen the cycle of the injecter to get more fuel not just up the pressure.
     
  3. azblazer

    azblazer 1/2 ton status Premium Member

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    From the third gen.org site....top down solutions sells a lit to run a vfpr with a diff spring and a vacum delay valve for under a $100. He sells a diff spring instead of the heavy one it comes with but the thread says for a stock motor you can use your old spring with the vfpr.


    DW
     
  4. tch777

    tch777 1/2 ton status

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    Vrfpr

    I have a VRFPR installed on my truck, but I can't use it unless I can get the fuel pressure to 17 or 18PSI. Once I get that set then when I put the vaccum hose on I will have 12 to 13 PSI at idle and 17 to 18 at WOT.

    Also higher pressure does flow more fuel there is a chart on CFM-TECH that shows the difference in fuel flow of a given injector at different fuel pressures.

    With the FPR set at a constant 12.5 to 13 PSI righ now the Sub jumps out of its skin until about 2000 RPM then it kinda flattens out, and if I back out of the throttle a bit the truck will start to accelerate quicker. This is a sign of leaning out.

    Can I just bolt in a Camero TPI fuel pump and get higher pressure without burning something up? If so what years work?

    Thanks

    Tim
     
  5. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Hmmm...interesting.! I've got one of those fpr's too but haven't fitted it yet. Post up when you get the answers as I'd be interested hear.
     
  6. dave_90_blazer

    dave_90_blazer 1/2 ton status

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    yes, I used a pump for a 89 camaro, 5.7(all the 5.7Ls(350) were TPI, direct replacement in the stock sender

    use a new peice of high pressure hose between the pump and the line on the sender though, I didn't and it sprung a leak, made lots of noise, all that high pressure spray inside the tank
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Just about any GM pump of that vintage will work. Mine is some Cadillac application that is 60 or 70PSI. It's pretty loud without the "silencer" installed. :)
     
  8. tch777

    tch777 1/2 ton status

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    Thanks for the replies guys!

    A Camero pump and a short section of high pressure hose.

    Sweet thanks for the information.

    Tim
     

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