Engine runs for 30 minutes in gear then stalls, as if it is out of gas. The rpm's slowly drop then stalls but if I put it in neutral, it remains running. It always starts right up but the next cycle becomes shorter - i.e. 10-15 minutes, then 5-10 minutes. I have done all the things that Don Moyer has suggested as follows -
Fuel side - new carb, new fuel hoses and vent hose, Facet pump new end of last season, new Racor, arrestor cleaned, no dirt in carb. I have bypassed the pressure switch to run the pump and it will pump 1 litre in a minute or less into a container.
Question - when I changed the fuel hoses, I used 3/8" ID hose to replace the 5/16" ones. Anyone know what effect this may have on the fuel delivery. I have conflicting info in my manuals - one says 5/16 and the other says 3/8. The local A4 dealer says it should be 1/4" ID??!!
Electrics - new plugs, points, condenser, rotor, cap, wires, coil, pressure switch.
General - compression is 101-103 psi on all 4 cylinders and 35 psi oil pressure. Gas tank was emptied and fresh gas with enzyme additive for Ethanol added.
Yesterday, I checked the exhaust back pressure on the exhaust flange and it is 1.0 psi but periodically rises to 1.5 psi and when it stalls, will read 1.0-1.5 psi.
I am open to all thoughts and suggestions.
Fuel side - new carb, new fuel hoses and vent hose, Facet pump new end of last season, new Racor, arrestor cleaned, no dirt in carb. I have bypassed the pressure switch to run the pump and it will pump 1 litre in a minute or less into a container.
Question - when I changed the fuel hoses, I used 3/8" ID hose to replace the 5/16" ones. Anyone know what effect this may have on the fuel delivery. I have conflicting info in my manuals - one says 5/16 and the other says 3/8. The local A4 dealer says it should be 1/4" ID??!!
Electrics - new plugs, points, condenser, rotor, cap, wires, coil, pressure switch.
General - compression is 101-103 psi on all 4 cylinders and 35 psi oil pressure. Gas tank was emptied and fresh gas with enzyme additive for Ethanol added.
Yesterday, I checked the exhaust back pressure on the exhaust flange and it is 1.0 psi but periodically rises to 1.5 psi and when it stalls, will read 1.0-1.5 psi.
I am open to all thoughts and suggestions.
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