Fuel problems
To check for air leaks in pick up lines and taps , check the vacuum with the engine running at the inlet of the pump and check it again at the outlet from the tanks .
Readings should similar . To carry out the test run the engine off a gravity can.
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Is it sucking air at your change over tap (or anywhere else on the suction side of the pump.)(flexible hose etc) When you say the diaphragm is good, is it O.K. with modern fuel? Wet the valves in your pump and then put a vacuum gauge on it. It should suck about 15" to 18" of mercury. The delivery should be about 2-2 1/2 psi (which is controlled by the spring) If it does that, and holds it, then work back down your lines, as per my first
Regards
Jim S.
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jim sewell
cmp and cckw
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