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Old 10-29-2010, 02:38 PM
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losing fuel pressure

I'm a little stumped. I have a edlebrock performer rpm mechanical fuel pump. I have a Jegs liquid filled gauge near the carb. I use a Holley fuel regulator just for insurance and to fine tune the pressure.
When I start the car and its cool or cold I'll adjust the pressure for 6.5lbs. As the engine warms I start slowly losing pressure, and at operating temp I down 2lbs.
I read that the liquid in the gauge is affected by the rising temp and this will throw off the reading. I know the fuel in the line does heat up a little and that would cause some differences in readings, but I never saw this.

I never noticed this on my race car with a electric pump and a non liquid high quality gauge.
Does anyone have any information on this.
Thanks
Lou

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Old 10-29-2010, 02:54 PM
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I just found out through another search that according to ericnova72 and T-Bucket23, the liquid gauge does this after heating up.
I'll be getting a non liquid gauge.
Lou
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Old 10-29-2010, 03:31 PM
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Or just set the regulator for 6.5 psi when the engine is cold and don't worry about what the gauge says.
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Old 10-29-2010, 04:35 PM
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I didn't know the edelbrock performer pump would produce more than 6 psi.
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Old 10-30-2010, 01:40 PM
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It can, and I like the fact that I can control it, and have the assurance of a constant and balanced pressure.
I went to a non fluid filled Mr. Gasket gauge and all is well.
Lou
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