Posted by Gerald J. on November 30, 2008 at 17:52:52 from (4.254.67.65):
In Reply to: 1990 F150 posted by John B. on November 30, 2008 at 17:17:52:
Check the fuel pressure regulator. The back side of the diaphragm is the vacuum system. A broken diaphragm puts fuel into the vacuum system and can make it run rich. I had an '86 with the 302 V-8 and it had only the single fuel filter in the frame rail. So when the vacuum diaphragm split the fuel pump could hold up injector rail pressure, but it put so much fuel to the hydraulic system that it hydrauliced the engine. Essentially it cost me the truck after a local shop caught it on fire trying to figure out why the cylinders were getting so much liquid gasoline (and the gas that got to the crankcase didn't do the bearings any good either).
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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