Fuel Pump Issue
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Sounds like you might need more help than I can offer. Does sound like you should check the pressure, they make it easy enough with the right gauge. I can tell you mine is on at least it's 3rd pump. (in 22 years).
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CF Veteran
Joined: Jun 2011
Posts: 2,448
Likes: 0
From: Colorado
Year: 1992
Model: Cherokee
Engine: 4.0
Hmm.. alright, I'll try and find that out. When I have the time this week, if I narrow it down the the pump, I'll replace it. I also changed the relay as well.
Thanks
Thanks
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Since you said it was noisy I assumes it's getting power. On the fuel manifold there by the injectors there should be a Schrader valve, like a valve stem on a car. That's where you check it.
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Originally Posted by 92XJGuy
Alright guys, so I was on my way to class last night, and my Jeep wouldn't start. It was trying to start but just wouldn't. I replaced the fuel filter and the relay, and turned it on, started right up. Then it started to have the same issue as before, trying to start but not. Now in order for it to start and run, I have to pump my accelerator before and sometimes during when I turn the key.
Sign of needing a new pump?
Sign of needing a new pump?
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,448
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From: Colorado
Year: 1992
Model: Cherokee
Engine: 4.0
I just need to clarify one more thing. It sounds like the fuel pump starts then stops when the car is started. I take it that's normal? Could this possibly be because the fuel filter was installed wrong? I have to pump the accelerator in order for the car to start.
Senior Member
Joined: May 2011
Posts: 517
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Model: Cherokee
It should only prime for a few seconds as the key in turned towards start ( but not crank ) you'll hear like an electrical noise for a few seconds and it *should* be fully primed. Assuming your fuel pump is good to go.
Mine does it like it should, but I dont think its holding the fuel pressure. I have to check mine at the schrader too.
Mine does it like it should, but I dont think its holding the fuel pressure. I have to check mine at the schrader too.
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,448
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From: Colorado
Year: 1992
Model: Cherokee
Engine: 4.0
After driving it for a while, it makes a loud humming noise that can be heard while inside. I notice it while at stop lights. This happened when I was mudding and around the time my alternator died (which is replaced now), so I'm not sure what caused it.
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CF Veteran
Joined: Jun 2011
Posts: 2,448
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From: Colorado
Year: 1992
Model: Cherokee
Engine: 4.0
And the pump is accessible without removing the tank, but it's easier with it off?
Thanks guys
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Originally Posted by 92XJGuy
Is the strainer part of the pump? I already replaced the filter, was I supposed to do it then?
And the pump is accessible without removing the tank, but it's easier with it off?
Thanks guys
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,448
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From: Colorado
Year: 1992
Model: Cherokee
Engine: 4.0
So I went to go double check my fuel filter installation, and the 'IN' was pointed towards the back of the truck. I then turned the truck on several times and it started right up, no foot pumping needed. So I'm starting to think it was a gremlin.. I haven't had the chance to hear the humming noise since I replaced the filter. I'm going to class tonight, so I'll be able to see what happens.
Thread Starter
CF Veteran
Joined: Jun 2011
Posts: 2,448
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From: Colorado
Year: 1992
Model: Cherokee
Engine: 4.0
Good to know. Earlier in this thread, you said yours died and started back up again. What exactly was it doing? Did you have to bump your accelerator to get it going? Before I turned it on today, I just turned the electronics on, by twisting the key once to hear if it would turn on. So I don't know if that helped it start up or not. I will be ordering a pump asap and hopefully do it this weekend.
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
It was just finicky.. some times it would make weird noise sometimes not. Sometimes I had to cycle the key a bunch to get it to prime sometimes not. Most of the time it worked fine then one day it just stopped.
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