TBI Fuel Pressure

[rfmaster]

In view of post #14 to 16 I would check the following:

1) FP voltage at the tank interface during cranking. This should be solid 11.4 to 12.0 volts
2) Check fuel supply lines for any restrictions, kinks etc. FF was replaced, correct?
3) I have suspicion that you may have a bad in tank hose between fuel pump and tank feed through assembly. The 12 PSI that you see during cranking might be compressed air in the fuel line. Since you have 18 PSI spring you should see 17 to 18 PSI during cranking (I use 18 PSI springs in my TB's as well).
4) fuel pump internal pressure regulator is bad.

You can manual force FP to operate by applying +12 volt to the red pig tail dangling from FP relay socket - no engine cranking is required. Run a fused (10 AMP inline fuse) jumper wire from +BAT to this pig tail. While FP is running perform a deadhead test by pinching return line - find rubber section and pinch it gently with pliers. Fuel pressure should increase well above 25 PSI if you have upgraded to TPI pump. If it does not look for a leaky fuel hose inside gas tank.

//RF