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Old 01-17-2015, 06:44 PM   #230
jimbosprint
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Join Date: Jul 2014
Location: Chico, California
Posts: 940
Re: jimbosprint 1972 C20 - the good, the bad, and the ugly

So after a couple tanks of gas I found my mileage was really bad (~9mpg), and so I did some research into that and the slight stumbling/missing problem I was having too. Turns out Edelbrock carburetors don't like more than 5.5psi fuel pressure and they are also sensitive to heat.

The other day I installed a 1/2" 4-hole wood carburetor spacer to help with heat insulation and supposedly help with low end torque as well. I also got a pressure gauge to find out the actual pressure coming from the stock mechanical fuel pump, and it was putting out 8psi.

Today I installed a pressure regulator. As I turned down the pressure I noticed a change in the idle. Just took it for a test drive and it seemed to have decent response and I didn't notice any stumbling. I won't say it's fixed until I can drive it for a while under various conditions and calculate mileage, but I am optimistic.
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