C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

fuel pump advice

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Old Jul 15, 2007 | 11:40 PM
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Default fuel pump advice

My fuel pump has been acting up lately. This weekend I think it gave it's last breath. Any advice or tricks on how I can get it going one more time and get the car (1992 six speed) to my local garage?

Secondly, any recommendations on what kind of fuel pump to replace it with? Is it ok to go with a stock one or better to buck up the cash now for an aftermarket one? I'm hoping on redoing the engine (383 possibly) in the future. I guess time is the other issue in that i need the car back and working ASAP.
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Old Jul 16, 2007 | 12:09 AM
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Default pump

how do you know it's the pump?
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Old Jul 16, 2007 | 12:28 AM
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Originally Posted by coupeguy2001
how do you know it's the pump?
Good question. I don't know for certain it is the pump.

I just didn't want to get into a long discussion about what actually is going on.

For the last little while the car occasionally will not start. It will fire for half a second and then stall. If I take the keys out, give it 15 seconds and try again it usually fires right up. It tends to do it when I am out doing errands and the car is warmed up. Once running the car is fine and my mileage has been around 30-32mpg on the highway.

I'm no mechanic so if you have thoughts on what else it might be I'm all ears. Thanks for the reply.
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Old Jul 16, 2007 | 07:16 AM
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Seems that the problem is temperature dependent. The temp has been in the 80-90 range for the weekend. I though I might try it when it is cool. She fired up at 4am this morning without a hitch. Made it to the garage and now we will have to see what they say. Aside from the fuel pump and guesses?
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Old Jul 16, 2007 | 01:00 PM
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My advice - buy the OEM pump. They are manufactured to precise specs while the aftermarket ones are not. Aftermarkets are doomed to failure, especially when the temp rises. The gasoline heats up, the metal vanes in aftemarkets heat up and because the specs are not as tight as OEM, the pump will cavitate, i.e. air and fuel will be pumped to the engine. At low RPMs, there is enough fuel to idle, but at higher RPMs under load (and with AC on at idle) the fuel volume is not sufficient to supply the engine. Most corvette shops that know their stuff will recommend the OEM pump. You pay for what you get and you don't want to be stranded several days later.
So, bite the bullet and buy the OEM, it pays to be smart, not cheap.
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