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TrailblazerSS,
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Discussion Starter #1
I recently sumped my factory fuel tank. I added on the rail holley 12-600 pump. -8 from sump to pump , than from pump to rails -6. Truck has holley mid rise manifold. When driving normal pressure i have set at 64lbs sometime under wot i see it spike down to 20, run leans than i let off it builds pressure. Happens randomly and only since i sumped it.
 

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trailer park living.
TrailblazerSS
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16,328 Posts
How much power are you making and where is the pump mounted? Got a pic of the sump?
 

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TrailblazerSS,
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Discussion Starter #3
ill take pics in a few.. but sump is on the rear side of the tank, and the pump is mounted on the rail of the truck..
 
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