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86 240 Wagon suddenly won't run without pumping gas 200 1986

uid 18083's pic
posted by  lucid on  Sat Jan 8 04:32 CST 2005
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

I tend to disagree with suspecting the tank pump because I've seen cars run seemingly well without it (though not good for the Main pump), and can't relate the tank pump to your "gas" pedal pumping.

As you know, all the pedal does is control the throttle, and thus the amount of air admitted to the engine. Maybe the pedal action is letting in extra air to allow an overrich mixture to burn erratically?

Have you pulled the vac hose on the Fuel Pressure Regulator to check for gas there (which shouldn't be the case)? A diaphragm leak would let gas get sucked straight into the manifold.

I would look at the plugs, after a starting "episode", and see if they look wet from excess fuel or rich-running?

If they look OK, then I'm the one who is all wet.

P.S. (1:00 PM) You might also try starting with the AMM unplugged. If it improves, the AMM is suspect. Sometimes just taking the AMM connector off and on cleans a contact or two.


--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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