Fuel Problems
#1
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Year: '96XJ - '97TJ(RHD) - '98XJ(RWD)
Fuel Problems
Hello all,
Last week I changed out the fuel pump, relay and filter due to the pump failing...pump was dead. It drove great for a week and now I have a strong pump and no start. I checked for pressure at the rail...just pressed the valve and gas just dribbled out. I swapped around relays just to make sure the new relay did not go bad and still no joy. Any ideas? (If I put this in the wrong forum, I apologize).
Christopher
Last week I changed out the fuel pump, relay and filter due to the pump failing...pump was dead. It drove great for a week and now I have a strong pump and no start. I checked for pressure at the rail...just pressed the valve and gas just dribbled out. I swapped around relays just to make sure the new relay did not go bad and still no joy. Any ideas? (If I put this in the wrong forum, I apologize).
Christopher
Last edited by craiso; 01-27-2011 at 03:16 PM.
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Year: 1989
Model: Cherokee (XJ)
Engine: 4.7 H.O.
Hello all,
Last week I changed out the fuel pump, relay and filter due to the pump failing...pump was dead. It drove great for a week and now I have a strong pump and no start. I checked for pressure at the rail...just pressed the valve and gas just dribbled out. I swapped around relays just to make sure the new relay did not go bad and still no joy. Any ideas? (If I put this in the wrong forum, I apologize).
Christopher
Last week I changed out the fuel pump, relay and filter due to the pump failing...pump was dead. It drove great for a week and now I have a strong pump and no start. I checked for pressure at the rail...just pressed the valve and gas just dribbled out. I swapped around relays just to make sure the new relay did not go bad and still no joy. Any ideas? (If I put this in the wrong forum, I apologize).
Christopher
#4
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It is not a fuel problem anymore. I replaced a few hose clamps that I had problems with, now I have plenty of pressure at the rail. It turns over strong, fuel pump running, but will not start. I pulled one of the plugs and it had fuel on it...I am alone right now so I can't check for spark. It was running great, for five days, now no start.
Christopher
Christopher
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I went out and found the CPS and it is reading 4 Mohms. It is cold out, but I think that is a bit high. I still have not checked for spark, but it looks like a replacement is in order.
Christopher
Christopher
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Year: 1989
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Engine: 4.7 H.O.
Typically, a bad CPS will kill both gas and spark, not one or the other. 4 ohms is not right at all. I just went and tested mine and the correct reading on my tester is OL. I would retest it to make sure that's it.
Last edited by sv41878; 01-28-2011 at 09:27 AM.
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Christopher
Last edited by craiso; 01-28-2011 at 01:54 PM.
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#8
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I finally got out to check for spark...nice blue spark is what I have. I have plenty of fuel pressure, but nothing this time on the plug. I read for the .5VAC-.8VAC from the sensor as the engine cranked and got nothing. Looks like the sensor is dead.
Christopher
Christopher
#9
Seasoned Member
Swap out the CPS and that should solve your trouble. you may want to also check the cam sensor in the distributor as well, just a thought.
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