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Old 09-24-2011, 03:26 PM
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Fuel starvation cause?

On my 1948 F1 pickup, I'm having a fuel starvation problem and I'm not sure why. Warmed over 350 sbc, well set up qjet fed by 3/8 steel lines and a stock replacement napa fuel pump. Less than 1000 miles on the truck, new fuel lines, filters, tank etc. Starves at high rpm when running through the gears. Maybe two causes. Could it be that the pump can't keep up? That doesn't seem likely to me. Second cause. I'm using a stock, behind the seat tank, modified to a top pick up rather than the stock bottom gravity feed. The pick up on top of the tank is at a height of 36" from the garage floor, the tank is 18" tall, and the pump is 16" from the garage floor. The pump has to lift the fuel the 18" from the bottom to the top of the tank, which is then 20" higher than the pump. I'm wondering if the tank being that much higher than the pump is the problems. At normal cruise speed, everything works fine, it's only when I'm moving alot of fuel. Am I asking more than a mech pump can do?

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Old 09-24-2011, 05:13 PM
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I have found in the past ,on a Q Jet the sintered filter in the carb itself will clog and starve the enging at WOT. I take them out and toss them.
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