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Old 08-18-2014, 11:23 AM   #1
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fuel pump/ fuel delivery problem??

Hey guys for those of you that don't know I have an 88 yj 4cyl 5spd, that phase lived up to its acronym. So what the problem is this time is that it seems like its not getting enough fuel, it starts kinda hard I have to pump it some times like a carb and it will idle but when I start driving it will bog out randomly, always in a short period of time though I'll get out of 2nd or 3rd and the motor will start lurching and missing like its starving and then eventually die. There's times in neutral where ill put it too the floor and it will rev up to somewhere around 3k and then just die while my foot is on the floor, but will idle again when it drops. Also I'm on my 2nd new Napa fuel pump that has screamed since the day I put it in and all new fuel delivery system

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Old 08-18-2014, 11:28 AM   #2
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Also forgot, this has happened twice about a week apart and both time it started after driving up a steep incline. But last time it ran fine after it sat for a day

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Old 08-18-2014, 11:33 AM   #3
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The 88 4 cylinder should have FI.

There was a similar thread to this recently, first questions is when was the fuel filter last replaced, and when you replaced the pump did you put a new sock on the pump?

If both of those are in a known good condition, the next step is to throw a fuel pressure gauge on the fuel port and see what your fuel pressure looks like at idle, and various RPM ranges. Report back with that info and we can point you in the right direction from there. With multiple Napa pumps being swapped in, my inclination would be to think that you are not getting a full 12v to the pump, you can also take the vac. hose off of the fuel pressure regulator and make sure it doesn't smell like gas, a leaking regulator could cause some of the issues you have noted.

With regard to the pump noise....I wouldn't worry too much, you are practically sitting on top of the gas tank, and the pump is hard mounted to the tank, so the noise of the pump running is really easily transmitted through the floor behind you and into your ear...let the fuel pressure gauge tell you what the health of the pump is, not your ear...that test only works in cars where a trunk filled with carpet is used to buffer the noise of the pump.
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Old 08-18-2014, 11:36 AM   #4
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Okay well I replaced the duel filter, pressure r
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Old 08-18-2014, 11:38 AM   #5
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Okay well I replaced the fuel filter, pressure regulator, and injector about 3 months ago. And the sock is good but both times when I changed the pump the new one hummed nicely for the first week or so and then gradually started screaming more and more. But I'll see if I can check the fuel pressure
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Old 08-18-2014, 11:42 AM   #6
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I am not saying you don't have a pump issue, but FWIW I have found that my pump is significantly quieter when the tank is full, and seems to get louder as the fuel lever drops.....if you don't drive your YJ much...maybe this is just fuel level related?

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