Question about 1991 Dodge Ram 150

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91 dodge ram 150 starts and quit some time starts and runs fine until i try to start it again dont matter cold or hot replaced fuel pump

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There is a box under the hood next to the battery with fuses and relays.
there is a fuel pump relay and or Auto shut down relay that could be bad.
It shuts down the entire system ignition and or fuel pump.
ASD Relay.

Posted on May 21, 2011

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91 dodge d150 3.9 keep cuttung off replace fuel pump, fuel filter and relay


Does it quit, then if you sit for a while, re-start for a while again, then quit etc . warmed up, quits, then sits and cools then re-starts?

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I'd have fuel pressure tested. I had a 95' did same thing. Cold winter day, worked fine, as soon as it got warmer, or hot out, it would quit, and re-start 20 minutes later and go for a distance then die again. If I parked in the shade on a hot day, I'd get further before it quit for the first time. I started carrying a fuel pressure gauge with me. Cool in the morning my fuel pressure was up to spec @ 49-50psi. Once it got warm/hot out and it died, Hooked up gauge and it was at 2-5psi. Let it sit and cool off 20-30 minutes, pressure would jump back up and run good until fuel pump got hot again and then pressure dropped off and car quit. It sure sounds like the fuel pump, but the hard part will be getting the car to the shop at the right time, or they will need to let it run on the lot until it quits to confirm the pressure drop. One thing you can try is when car quits, have a can of WD-40 or quick start with you and a screwdriver. Loosen the clamp on the air intake hose where it connects to the front of the throttle body and pull it off. With vehicle off, turn throttle linkage so the plate opens up enough to spray WD-40 a second or 2 in the throttle body. Then try to start it. If it starts and runs momentarily, then you can be pretty sure it's fuel related and my guess is the pump needs replacement.

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I just replaced the fuel pump in my 92 dodge ram 150 5.2 318 and it still wants to start and studder and run like its starving for gas and i start it and turn it off and restart it 3-5 times until it...


Did you replace fuel filter and why did you replace pump in the first place? Is there any junk in the gas tank? and did you flush the lines out? Also is the fue pressure regulator in working order?

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It won't start when it is cold but starts fine when warm. Will start eventually if you pump the heck out of it and crank it and repeat quite a few times. I have a 91 cherokee that won't start when it's...


Try cycleing ur key a few times before actually cranking it alot of the time wen a fuel pump is about to go it wont prime cycling the key will prime it. As for the fuel gauge thats part of the fuel pump its called a sending unit and in the jeeps its all in one unit. it sounds like your fuel pump is about to go tho. i had the same problem with my 93 jeep grand cherokee laredo. i replaced the fuel pump and it runs fine now u can get it from your local autozone for about 140. hope this helps let me know

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The check valve on the fuel line at the filter housing may be leaking back not maintaining pressure when the engine is not running.

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