Hello, I just replaced the fuel pump in my 94 4.0 Ranger and when I started it up on jack stands I thought that was the culprit of all of my troubles because it ran beautifully. I shut it down, put the filler neck on, dropped it off of the jack stands and it started to cut out again. The fuel pump is definatly good. I researched more and found and article about the interia valve, I checked it(all good), jumped it , then put it back on the truck so I have ruled that out. I have replaced the TPS the fuel pump relay, fuel filter, I have replaced the MAF with one off of a running truck so I know it works. THe thing is, when I take off the MAF it seems to smooth out just enough to take throttle so I can pull it back in the garage.

I am at the end of my rope, could someone please look into my symptoms below and give me some guidance.

I had posted my syptoms in a couple posts that I am quoting below because I do not know how to link to them.

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I have been having trouble with my 94 4.0. Sometimes the fuel pump wont kick on (so it wornt start). Other times it will run fine for a while but then while I am driving it will start bucking, kicking in and out of power. I get a dead pedal and loose power.

I thought for sure it was the fuel pump because it wouldn kick on when I turned the key to ignition. Then I went out last night and it did kick on, the truck started runnig bad. So I unplugged the MAF sensor and it started running better. I had changed the MAF last summer but I thought it was defective. I borrowed my brothers MAF and it still runs bad unless I unplug it. Any connection between the MAF and fuel pump? I had gotten to the point where I thought for sure it was the fuel pump, but now that I unplug the MAF I am not sure.

I have already changed the relay and fuel filter. Any suggestions? "


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Hello everyone. I am having trouble with my 94 4.0 ohv ranger. I think it's the fuel pump but im not sure. Sometimes it will run ok but then it will start to cut out. I'll be going along and it will loose power. I can put my foot to the floor and go about 25. It will get a little gas but it wil buck like a bronco(horse not suv) until I can get it off of the road. It will usually start but sometimes it wont even do that. I switched out the fuel pump relay and thought it fixed it but I was wrong. Does anyone know what might be causing this? I just wanted to make sure that I am getting the right thing before I drop $100+ on a fuel pump.

Also, if it is the fuel pump, is there a aftermarket fuel pump that isnt quite as pricey as the OEM? I know where there is a cheap holley pump but I am used to old carb engines and I dont know how that would work with the computer.

Any help is appriciated.

Thanks, "

 

Have you checked/replaced the coil lately?

 

I replaced it with a used one last year. It looks pretty good where it seals. I will test it though.

 

My friend was telling me about a secondary fuel pump "high pressure" fuel pump on some models. COuld there be one on my 94 4.0l?

Also i am pretty sure they are not interchangable but my friend was asking if I wanted to try swapping the computer with one from a early 90's straight 6. Those wouldnt work would they?

Thanks again,

 

I should add...

Does my 94 4.0L have a second fuel pump? If so, wher can I find it?

Thanks,

 

I don't think your truck has 2 fuel pumps. There's only one located at the fuel tank.

 

Your other fuel pump should be located on the drivers side frame rail.

 

Hello I've been having problems with my 94 ford ranger 4.0l v6. At first it would just start to sputter and cut out all of a sudden with temp. not seeming to be the trigger. I have been fighting this battle for months. It was so intermittent that it was hard to track, finally it would not run the pump one day at all. I changed the pump and started it up and it ran great, then I put the filler neck on and lowered it off the jackstands.after I lowered it down it ran then started to cut out again. I can start it and it will run but not great. Sometimes it will die out. When it starts to die out I can unplug the Maf and it straightens out a bit. I have already swapped the Maf with one from a running truck though and another one as well. What else could be my problem? In the prior months I had changed the following:
Maf
Fuel pump relay
Fuel pump
Fuel filter
Throttle position sensor
Checked the inertia valve
What do u think could be wrong? If it is the ECM is it in the interior of the drivers side firewall that it gets pulled from? Any help is appreciated! thanks

 

how is the cat?

 

We actually ran it with the cat disconnected a while back and it didn't make much difference, the cat looks good and I cant hear anything rolling around in it.

 

How do I test my fuel pressure regulator? I have been looking at some posts but...

I don't see a tee on the fuel pressure regulator. There is just one braided line that goes into it. Is mine spring controlled rather than vaccum or am I looking in the wrong place? Also I borrowed my buddies pressure tester and the shreder valve appears to be smaller than the gauge. Is there a specific size adapter I need?

 

im having a similer problem on my 06 ford ranger truck would run for bout 15 min then lose power so I figured it was the alternator also both cats are new all 4 o2 sencors replaced along with the radiator and thermostat started up and ran it for 15 min and it ran beautifly cut it off and went to crank it and it wouldn't turn over so I figured the fuel pump went out checked fuses and relays all looks good so replaced the fuel pump motor no change any ideas? also iv notice im geting power to the pump but when I plug in the pump motor I lose all power to the pump .
PLEASE HHHHHHEEEEELLLLLPPPPPP

 

I had something similar happen on my old 01 Sonoma turns out I had a bad ground connection. The electrical was on the same circuit as the rear lights which had a loose ground.