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Old 03-24-2008, 01:45 AM   #1
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95 2.5l fuel pump

i have a 95 wrangler with the 2.5l 4cyl. a few weeks ago she would struggle to start but once it did she ran fine, now it has come down to just cranking and nothing. replaced the fuel filter that wasnt it. checked the fuel pump its not priming not doing anything so i replaced that, still the same results. it seems like the pump is not getting power checked all the fuses under the hood and they check out fine. what can i do to check the electrical part of the fuel system any tricks or tips.

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Old 03-24-2008, 08:30 AM   #2
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really you need fuel gauge first to make sure fuel pressure isn't there, then you need a test light, and a wiring diagram to see which wire is power, and see if power is getting to fuel pump

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Old 03-25-2008, 10:03 PM   #3
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yeah but there is no fuel in the lines... i used to be able to hear the pump prime and now it doesnt at all... anyone with a fsm for a 95 wrangler that would be able to tell me what wire is power for the fuel pump
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Old 03-25-2008, 10:18 PM   #4
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i just looked in my raggedy old haynes manual, these are crappy diagrams, it gives me everything but a good diagram at fuel pump. looks like orange wire from this diagram. i can check at work if this isn't right.
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Old 03-26-2008, 06:19 PM   #5
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If you find out it's getting power, double check the fuel system. Make certain the pump isn't running. I have a 94 i bought to rebuild and had a very similar problem. I bought it not running, and the guy i bought it from said it was an electrical problem cause he tried spraying a little starting fluid in it and it still didn't even try to start. So when i got it, i replaced the plugs and wires just because they needed it, and if fired right up. I though my problem was solved. Then over the next day or so it began starting harder and harder till all it did was crank. Here what it was was the fuel pressure regulator was bad and it was letting to much pressure to the injectors and the injectors were spraying to much fuel when they would open, so much that when you'd take the spark plugs out of all the cylinders and crank the motor, fuel would shoot out of the holes for the plugs. I replaced the regulator and it ran fine after that. It was dumping so much fuel in the cylinders that it was more or less drounding out the spark. Your situations sounds very similar.
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Old 03-26-2008, 09:58 PM   #6
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yes thats exactaly what happened to me but there is no fuel in my fuel rail or the lines going in... i cant hear the pump priming like it used to
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Old 03-27-2008, 12:49 AM   #7
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Chilton's backs up what jpdocdave half said - at the fuel pump - power is orange/black, ground is black/yellow.

If you're not getting power to the pump, check the relay (in the PDC under the hood). If the relay checks out ok, corrosion in the orange/black lead is also a possibility - my dad's 99 TJ stopped working out of the blue one day while driving it because corrosion existed in one of the connections between the relay and the pump. Took a shop tech nearly 2 hours to dig through all of the wiring and find the bad connection.

A quick way to make sure you're getting power to the pump is (I think) to see if the fuel gauge on the instrument panel is responding at all. According to the diagrams, the gauge sending unit gets its power through the pump relay and after the pump, so if it is or isn't reacting that should also indicate whether the power is making it to the pump. I think.

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