Originally Posted by
Staterules9
ala_xfire, I took a look back at those harness connectors and noticed the hinge so I was able to pop the top and measure the voltage. When the key is first turned to the on/run position the voltage between the 3rd and 5th pin jumps to 10-11 volts and then drops off. The same is happening at the positive and negative terminals of the pump itself. The battery is reading just under 12 volts on my meter.
The car is still turning over very strongly when I try to crank it but it isn't firing. Also there is still no noise from the fuel pump when at turned to the on/run position. Is it time to order a new pump or is the slight voltage drop relative to the battery a red herring I should look into?
Sounds like a bad pump to me. Of course, the pump does cut out in a few seconds, if the ECM detects that the engine has not started. TO verify there is no fuel presure, you can always put a gauge on it.
I bought one of these at Summit Racing. It comes with small and large Schrader valve fittings for the Crossfire and Ford Ranger - so any car with a "Schrader valve" on the fuel rail is easy to measure. My Crossfire runs around 56psi and the Ranger runs around 60psi. If I ever had a problem with them, at least I know what "baseline" is.
It is no harder to measure fuel pressure than it is tire pressure with one of these (tho smoking while using this will set you and the car on fire, you bleed a little gas using it - so don't do this with a hot engine).
