Guest foxstang89 Posted May 8, 2007 Report Share Posted May 8, 2007 I have a stock 302 in a 89 mustang thats carburated w/ a air gap four barrel intake. The Carb of choice was a 650 Holley double pumper. I cannot get the engine to run right? You can adjust the carb and timing, but nothing changes. Runs very, very rich and have to change spark plugs after 4-5 min of running. The car runs great while it runs out of gas? Quote Link to comment Share on other sites More sharing options...
twistedfocus1647545489 Posted May 8, 2007 Report Share Posted May 8, 2007 I'd start by checking for vacuum leaks. If nothing changes when you adjust it (like screwing the mixture screws all the way in or something) it's probably pulling air in somewhere else and will not be able to meter the fuel correctly. If this is an old carb check around the carb itself for leaks (especially the throttle shaft), as that's an often overlooked source of vacuum leaks. Quote Link to comment Share on other sites More sharing options...
351mach11647545510 Posted May 8, 2007 Report Share Posted May 8, 2007 if all else fails and everything checks out but it keeps running that rich, check your floats. might be stuck. Quote Link to comment Share on other sites More sharing options...
Guest foxstang89 Posted May 8, 2007 Report Share Posted May 8, 2007 I have replaced both floats, needle and seats, cleaned the metering blocks, replaced the power valve. Everything is adjusted correctly. Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted May 8, 2007 Report Share Posted May 8, 2007 whats fuel pressure?should be 5.5 to 7 anything over 8 and it will fload. where do you have the floats set? do you have the right distiburtor in it? last time i seen someone have this same issue, they was tryying too use the FI dizzy. im sure i could get you on the right track. Quote Link to comment Share on other sites More sharing options...
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