Question about 1997 GMC Sonoma

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My truck turns on but the fuel pump make a weird noise and then turns off.... i changed the fuel filter but it still does it..... what could it be????

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Worn out fuel pump

Posted on Mar 17, 2011

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Posted on Jan 02, 2017

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I have changed the fuel pump and got some pressure but then it wouldn't start again so I changed the fuel pump again but this time I changed the fuel filter but the car wouldn't start and I'm not getting...


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My truck does not start. I changed the spark plugs and tested them for spark. That works. I changed the wires and rotor. I changed the fuel filter.


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I have a 1981 ramcharger 318 4 barrel edelbrock carb. it starts fine, drives well for about 15 min but dies. dies quicker when 4 barrels kick in. about 2 min after dying it will start up fine and do it...


Those rattly noises are detonations,  caused by a very lean mixture. All the other symptoms indicate that the fuel flow to the carb is too low. Since you have replaced the pump and the filter, the only other things left to check are the lines and the tank sump. Or you could install a much larger pump.

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Have you changed the fuel filter? I know it sounds weird but a plugged filter will make a truck use more gas. The computer tries to compensate for less fuel by commanding the injectors to open longer. Also a plugged filter will cause excess back pressure on the fuel pump making it loud.. Good Luck.

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1 Answer

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