Question about 1987 Ford F 250
Hello, I have a 1987 F-250 with the 7.5 L 460 engine and a Holley 4B carb. When the vehicle sits for more than 8 hours I have to pump the accelerator around 20 times to get it to start. Once it starts it runs great. I read somewhere about some kind of a gasket in the carb that can "backfire". I just want to know if this might be the problem or if it could be something else. Thanks.
Check the choke, with cold engine open throttle all the way and let go, butterfly on top should be open about1/4", also I would check your accelerater pump diaphragm sit in the carb. look in carb. pump throttle and see if you see gas spray, if you do pump diaphragm is good, if none bad diaphragm
Posted on May 27, 2010
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Posted on Jan 02, 2017
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Oct 13, 2013 | Cars & Trucks
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Along with the vacuume leaks I would check the carb. The accelerator pump might be out of adjustment or something else in the carb. Currently I have the same problem with mine and I just adjusted it and for 1 day so far it's ran fine but I have a holley on mine. Carb may be dirty also.
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