so I gave it time today to build fuel pressure...I left the key to on, walked around to the fuel tank but could not here the fuel pump (I am not sure if it is like a chevy and has the same type of whining sound). I must have waited about 3-4 minutes. I turned it on and it did not die. All it did was rev to 2 grand (because it was cold) and then drop down to where it sounded like it was going to die...but it didn't. It did this about 4-5 times and then ran fine. Is there something wrong with my fuel pump? It is a pretty expensive part so how can I find out? Would a clogged fuel filter do this?
Have you tried running a jumper in the diagnostic box for the fuel pump?
If you run a jumper and then turn on the ignition, you should have no trouble hearing the fuel pump as long as the pump isn't froze up. For my truck, the jumper goes on FP and +B and as long as it is jumpered and the ignition is on, the pump will keep running.
If you can hear the pump running while it is jumpered, try starting the truck. If the truck now runs, it sounds like you have the same problem my truck just had and that was a bad AFM.
From the best that I could tell by looking at the wiring schematics, there are only 3 things that prevent a good pump from running while the engine is trying to run and for my 1989 22RE it was the EFI Main Relay or the Circuit Opening Relay and the last was the AFM.
To check the AFM on my truck, I had to remove the electrical connector from the AFM to expose 7 terminals.
As you are looking at the 7 terminals on the AFM, I had to connect my ohm meter to the 2nd and 3rd terminals from the right. These terminals are called Vs and E2 and when the ohm meter is connected to these 2 terminals you should have 200-600 ohms. My truck had 0 and after replacing my AFM, it purred like a kitten.
I got my best deal at Schucks by going on line to the Shucks website and then I took that information to the local Shucks store where they met that price. It saved me over a hundred bucks compared to me just walking off the street and buying one.
I hope this helps.
Ken
