1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Fuel pump: exactly how loud should it be

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Old Feb 11, 2002 | 09:59 AM
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cletus's Avatar
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Fuel pump: exactly how loud should it be

Ok, the fuel pump in my '84 is quite audible. I'm thinking this is probably a bad thing. It's kinda funny though because the pitch of the hum changes like when you use the turn signals or hit the brakes. I'm guessing these things generally shouldn't be that loud and I am starting to wonder if it may be the reason the car is hard to start when it hasn't been run within like 6 hours. Even when I get it started, it'll run fine for a few seconds then die once or twice, like it is just running out of fuel. But after that it is fine.
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Old Feb 11, 2002 | 10:26 AM
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From: Socal
is it a stock fuel pump or after market? any carb mods?
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Old Feb 11, 2002 | 10:54 AM
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No carb mods and I don't really know if the pump is stock or not. I seem to recall the previous owner mentioning he had changed it, but I'm not 100% positive.
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Old Feb 11, 2002 | 11:12 AM
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The pitch of the hum changes for the same reason your headlights dim when you hit the brakes... you're just causing extra load on the alternator. I dont think it will fix your starting problem, but if it's humming badly, I'd change it. Might as well do the fuel filter while you're at it. BTW, the stock pump should be silent.
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