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<DIV><FONT size=2>You do need to drive until you get the problem then remove the
cap and see if you get a 'whoosh' or not - you should not even with the
non-vented cap as the venting comes from the charcoal canister.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Pump chattering when you seem to be suffering from fuel
starvation is a sign that either the pump is sucking in air, or cannot pull fuel
through. You need to remove a delivery pipe from a carb (be prepared for a
spurt of fuel if the ignition has been on recently), direct it into to a
container and turn on the ignition. It should deliver a minimum of one
Imperial pint per minute - and in practice at least double that - in a
continuous series of pulses with minimal bubbling. </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>If you get a low delivery rate with lots of bubbles it is
sucking in air, which could be a bad joint, or the fuel level below a
perforation in the pickup pipe.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>If you just get low and erratic delivery with negligible
bubbles then it indicates a blockage in the pickup pipe, or possibly the
non-return valve in the pump inlet leaking back.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>If the pump is chattering away when it shouldn't be then
that's the main problem. IF there is a spark issue, you need to fix the
delivery first, then see how it runs.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>PaulH.</FONT></DIV>
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<DIV>Something I couldn't help but notice is that the fuel pump was clicking
like it was pumping out of an empty tank even though that wasn't the case at
all. It wasn't clicking as quickly as I've heard it do before, but still not
shutting off even though there was no reason for it to be pumping. There are
no signs of leaks, no fuel smells. I also wonder if it could be as much a
spark issue as a fuel one.</DIV></DIV></BLOCKQUOTE></BODY></HTML>