I have a '68 bird with 250 OHC, in-line 6, single barrel carb. I also have what seem like a 2-3 second delay from when the time I mash the gas to when the car responds. I recently had a reputable carb shop rebuild my carburetor and really dont think that is the issue. Someone suggested replacing the fuel pump. I can't find an exact one anywhere for this eng & carb. I tried all major restoration catalogs and parts stores. Anyone know where I can find an exact match or suitable replacement? Any help or suggestions are greatly appreciated.
It doesn't sound like the fuel pump to me. Sounds like the accelerator pump that Ponti described. However, you see the OHC fuel pumps pop up on Ebay from time to time. I recommend having a spare anyway.
Fuel pump symptoms are usually loss of power at higher RPM's; not off the line stumbling.
Unless the car stumbles throughout the entire RPM range.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
It turned out to be a vacuum leak at the accelerator pump adjustment screw. when it was rebuilt it must not have been screwed in enough to prevent it from leaking. after adjusting, the vacuum pressure increased 5 psi. Contributing factors, needed new points and condensor and bad gas. Thanks for all the helpful advise, it sent me in the right direction.
