solar7647
Lieutenant Junior Grade
- Joined
- Apr 23, 2009
- Messages
- 1,218
I have been chasing a fuel issue since i rebuild my 3.7L Merc. I believe i have found it but need to verify my understanding of mechanical fuel pumps.
I have the pump removed and noticed that when you manually pump it you get suction and air flow threw the sight tube outlet.........that means the diaphragm is bad right?
My sight tube is all dirty (time to replace) so I never noticed fuel coming up, but the engine acts like its flooding out, idles ok but when you give it throttle is just bogs and dies.
Done so far to find issue:
checked and reset timing 4 BDTC, valves all good by compression test, carb swap, new plugs, wire, electronic ignition, clean gas. Carb swap was with same kind of carb (Q-jet not new but functions)
I have the pump removed and noticed that when you manually pump it you get suction and air flow threw the sight tube outlet.........that means the diaphragm is bad right?
My sight tube is all dirty (time to replace) so I never noticed fuel coming up, but the engine acts like its flooding out, idles ok but when you give it throttle is just bogs and dies.
Done so far to find issue:
checked and reset timing 4 BDTC, valves all good by compression test, carb swap, new plugs, wire, electronic ignition, clean gas. Carb swap was with same kind of carb (Q-jet not new but functions)