Fuel Pump on its last leg?

[pathwayus]

A few week ago with some help hear I end up replacing the fuel pump in my 94 x. Last Friday I was able to tag and but her on the road after working on her all fall. The first two day I drove it Every thing seem ok other then being a little slow going up hill. The next day I pull in to walmart to get some stuff walk back out and start up and start to turn around it bogged down and died. After five hours got it started and drove home but couldn't go push the throttle over 3/4 or it would start to bog down as soon as i let up it was fine. The next day it did the same thing when I was going out the drive way. Once again i worked with it and got it to start. So today i changed the fuel filter witch was full of dirt. I started it up and ran I took it about a mile down the road and back and was anytime you would push the throttle over half way it would bog out. When I pulled in the drive I turn it off and restarted it and it hardly runs. This lead me to believe the pump is bad (again). I guess next time ill by a new one and not go to pull a part for it even if it does look new.

 

[phix-]

Could be a couple things, did you change your fuel filter? How strong did you make your connections when replacing the pump? (i.e. solder, heat/shrink wrap, and barrel connectors?

 

[Maniak]

That sounds eerily familiar.

Our '92 was having issues when the throttle was pressed down somewhat far. It was actually fuel starving, not bogging, but when you lifted the throttle it was fine.

I could mash the throttle and hold the rpms at 4000 in park/neutral and it would run fine (never did it more than about 30 seconds as 4000 rpms is loud/scary).

The less fuel in the tank, the worse it got. It got to the point where it couldn't get over 2200 rpms and about 1/2 throttle while under load.

I tried cleaning the MAF and I even went as far as changing the MAF and the tps with my spares.

I found if I drove it right at the edge of the issue I could get a 172 code which means its thinking its running lean.

I checked the fuel pressure and I had 32 at idle and 40 at idle with the vacuum line disconnected. If I held the rpms up using a brake stand (which is 2800 rpms on our X) the fuel pressure droped to 29psi.

At that point I ordered a fuel pump and filter. I swapped them both on Saturday (took about 3 hours) and viola. Problem is fixed!!!

So, in short. I think you have a fuel pump that is low on volume and/or pressure.

btw.. when I took the fuel pump out I found the sock had come off and the pump bracket broke so the pump was just hanging from the hose.

~Mark

 

[Tbars4]

...Just curious..:scratch:

..Did you get a ping like it was sucking more air than fuel during this Maniak?

 

[Maniak]

Nope, no ping. just fell flat on its face.. and when I got it to make a lean code by staying right at the edge of failure it confirmed how it felt.

~Mark

 

[pathwayus]

Could be a couple things, did you change your fuel filter? How strong did you make your connections when replacing the pump? (i.e. solder, heat/shrink wrap, and barrel connectors?

I replaced the hole unit not just the fuel pump because the other one was 18 years old by the looks of it,the unit looks new but there no telling how long it was at pull a part so it could have went bad I had a ranger do the same thing, I changed the fuel filter thinking it was the because of it being old. I just got back home and i started it and It was running under 500 rpms and wouldn't rev. acts the same way it did when the last fuel pump died.

 

[Tony H]

I replaced the hole unit not just the fuel pump because the other one was 18 years old by the looks of it,the unit looks new but there no telling how long it was at pull a part so it could have went bad I had a ranger do the same thing, I changed the fuel filter thinking it was the because of it being old. I just got back home and i started it and It was running under 500 rpms and wouldn't rev. acts the same way it did when the last fuel pump died.

My gut tells me it's Fuel Pump issues BUT Just another look at it. Are you getting Rich exhaust out the tailpipe??
Could be the Fuel pressure regulator died and you are getting too much fuel.
flooding out when pedal is pressed.

 

[pathwayus]

I don't think so, but the x wont run that long now for me to check and see I try and check and see tomorrow before I leave to go to work.

 

[pathwayus]

We have a 1994 Ford F150 with duel tanks the front tanks is leaking and the back one is new where going to be taking the front tank off and running only the back tank. Where doing this because the over flow from the back tank form the motor back is going to the first tank and its leaking out. It got the v6 302 (might be 305 can't remember off the top of my head). Would the fuel pump off the F150 work on my 1994 x?

 

[Maniak]

No, the fuel pump assembly is different. At least when I last checked.

Also, if the return for 1 tank it putting the fuel into the wrong tank, its the fuel tank selector valve causing that.

~Mark