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I have a 88 camaro 2.8 that I just replaced the fuel pump an will now run but its not running good unless u cover the maf sensor I replaced all the gaskets from the intake up still same problem checked for fuel pressure great at times an nothing but air every now an then please give me a opinion

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  • Cars & Trucks Master
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There is a cold start sensor on the fuel rail that acts up at times

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SOURCE: car wont start

check your fuel pressure it should be 35 psi .fuel pump relays dont go out but check all fuses with test light there is a fuel injector fuse but most likely problem is your fuel pump!

Posted on Mar 11, 2009

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2000 Mercury Mountaineer 5.0L dumping gas into intake manifold and detonation in exhaust manifold on exhaust firing cycle


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1 Answer

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It could be a relay that keeps the fuel pump running when the ignition switch is in the run position. My jeep had this problem, where the pump gets power in the start position but once the key returns to run, the engine shortly stops running because the pressure in the fuel line drops off as it is used by the running engine, it usually died within 3 seconds. my relay was under hood and there were several of the same type in there, I switched the fuel system one with the one for my AC(which only blows hot anyway) Hope this helps...

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Check to see if there's power at the fuel pump when cranking the engine. If no power, check the relay and oil pressure sender switch. If the engine looses oil pressure, it stops the fuel pump from running to protect the engine. The relay is located on the firewall above the master cylinder.

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1 Answer

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Hi
Turn key on a listen for fuel pump running in tank. The fuel pump should run for 3 to 4 seconds and kick out. If not running try tapping bottom of tank with a soft hammer and fuel pump might start working but if this is the problem it will have to be replaced.

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