fuel pump not working

[p-townranger]

i have a 88 4x4 ranger and my truck just stop runnin the other day. i think it has something to do with the fuel pump but i pulled my bed off and i have no power at my fuel pump so can anyone help me please!!!

 

[Hardwareman]

Try switching over relays or checking fuses?





Allen

 

[Jorley]

A fellow had the same problem very recently. Go here for how he tracked his problem down.
http://www.therangerstation.com/forums/showthread.php?t=13548

 

[p-townranger]

i check the fuses and there all good an switched relays

 

[Jorley]

Check the interia switch. Passenger side, behind carpet, next to tranny hump. Reset if nessecary.

 

[p-townranger]

ok i will try that but i am at work right now so i can not see if thats it
is there any thing besides that that i can try

 

[shadetree]

You will not have power at the pump if the engine is not running. When the ignition key is first turned on, you will have power for approx 2 seconds. The computer then waits for ignition pulses before starting the pump again. This occurs when the starter starts turning the engine over.

Power flow is as follows:
Ignition on, EEC relay closes contacts supplying power to the fuel pump(fp)relay coil(red wire) and engine sensors.

At the same time the computer grounds the other side of the fp relay coil thru the tan/lt grn wire, and closes the contacts supplying 12v from the yellow wire to the org/lt blu wire going to the inertia switch.

From the inertia switch, it goes to the fp.

You can jumper the tan/lt grn wire to ground, this will close the relay, and the pump should run all the time you have the ignition switch turned on. This will allow you to follow the power source all the way to the pump. shady

 

[IMenriched]

TFI or AKA Ingition Control Module...on the back side of the distributor, they have a fuel control element.

CLean and check your grounds.

 

[p-townranger]

thinks i will try an see what i an do when i get home
gash it suck havin a broke down ranger with no other ride
but thinks agian

 

[Jorley]

unplug relay, jump yel wire to org/Lt. blu, pump should run key on or off.

 

[p-townranger]

fuel pump relay is the one with the green wire right???

 

[shadetree]

unplug relay, jump yel wire to org/Lt. blu, pump should run key on or off.

You can do it this way, but if you ground the pump relay, you will be able to check the system in its normal state with all components in place and possibly isolate the problem to one circuit or another.

It is recommended that the ground be placed on the self test connector, but I don't think the poster knows what this is. shady

 

[Jorley]

You can do it this way, but if you ground the pump relay, you will be able to check the system in its normal state with all components in place and possibly isolate the problem to one circuit or another.

It is recommended that the ground be placed on the self test connector, but I don't think the poster knows what this is. shady

You have a point. I didn't think about it like that. The way I suggest would only test the wiring and the interia switch, not the other components.

 

[Jorley]

fuel pump relay is the one with the green wire right???

The relay should have yel, org/Lt. blu, tan/Lt grn amd a red wires going to it.

 

[p-townranger]

thinks it was my module on the back of my distributor so the ranger is up and running with new 31/10.5/15 cooper discovery stt's