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    1964 rq4071

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  1. Hey everyone, Just putting up an update here. Been a little busy, but the surging was annoying me so I dived into it a bit more. Looks like the fuel pump is degraded. I hooked up a pressure gauge, was reading 4-4.5 pounds at idle. When it warmed up, pressure reading dropped to around 3. Noticed on the hard acceleration, the pressure dropped down to 1 pound, but would recover back to 3 when the rpms came down. Did a suction pressure test and got around 4-5 inches of vacuum. Shop manual says I should be expecting 5.5-7 pounds on the fuel pressure and about 10 inches of vacuum on the suction pressure. I also went through the carb, make sure nothing was sticking with the floats and everything looked good there. So even with any inaccuracies in my gauges, I think the fuel pump is the issue. I'll be replacing that when I get a chance and see what happens. I'm thinking the fuel pump was operating right at the threshold of decent performance, hence why sometimes I got the surging and other times I didn't. I also noticed that when I plugged the vapor return line off of the filter, the engine ran better too. I haven't been getting any vapor lock, so I'm gonna replace the filter with a normal inline without a return line. Hopefully this'll fix the issue!
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