Fuel Pump? Maybe? Maybe not? grrrrrrr

[mikewurtz]

I'll make this as short and sweet as possible. Quick side note, if you frequent other Ranger forums, I did in fact post this in multiple forums (trying to cultivate as much collective info as possible).

I have a 1999 2WD 4 cylinder Ranger. When I tried to start it one day, it fired right up and immediately died. I restarted it and revved the accelerator, it ran as long as I pushed the gas, but immediately died when I stopped. Several starting attempts, same result every time - perfect start, will not idle at all.

I did my research and most forums and articles contained the same possible diagnosis . . . fuel filter, IAC, or MAF. So I decided to start with the cheapest option, the fuel filter.

After I bought the part (and the stupid disconnect tool that ended up not fitting) I crossed my fingers and hoped that it had magically repaired itself and tried starting it . . . no luck. So I disconnected the fuel inertia switch. I started it up to relieve the fuel pressure, and . . . it actually ran for a few seconds.

What could that mean? Why would it try to idle with the fuel inertia switch disconnected but immediately die when it is connected? Is my fuel pump bad? Is it an air flow problem? Thoughts . . . .

 

[Earl43P]

Clean your IAC.

 

[chilsam]

Tps?

 

[4b316]

Did you put a gauge on it and check the presure?Mine did the same thing and I had a small vacum leak

 

[shovelmike]

fuel pressure

Get a guage and check fuel pressure, I tried the cheap and easy: fuel pump relay & filter, then checked pressure and wasn't good.
Pull the bed, then the pump is easy as pie to change.
My symptoms were similar.......all is good now.

 

[dave91ranger]

I had a similar problem on my 91 4.0 and it was the fuel pressure regulator, it running fine with inertia switch unhookd could be cause that is disabling the fuel pump and stopping it from dumping more fuel in? Just a suggestion

 

[slolearner]

fuel pump???????

unplug MAF and see it it affects it.