'75 W200 won't idle
#1
'75 W200 won't idle
Hi all, the truck in question is a '75 5.9l W200 with a Holley 2 barrel carb. The truck sat all summer and the gas went bad in it, so I replaced all the gas and dissasembled the carb to clean it out (there was a lot of gunk in there). I had it running great for a while and then out of nowhere it stalled out. It will start (hard), but now it refuses to idle. If I rev it and hold the rpms up after a few seconds it will start to sputter and will stall if I don't pump the gas. The accelerator pump is working, and seems to be the only thing that will keep the truck running. Also, the float bowl is always full of gas when I take it apart.
To me it seems like the carb still has gunk in it and it's being starved for fuel. I've tried cleaning the carb three times with no change in performance. I've checked for vacuum leaks, can't find anything obvious.
So where do I go from here? Timing issue? Fuel filter? I'm at my wits end here guys, so any help is appreciated. Thanks!
To me it seems like the carb still has gunk in it and it's being starved for fuel. I've tried cleaning the carb three times with no change in performance. I've checked for vacuum leaks, can't find anything obvious.
So where do I go from here? Timing issue? Fuel filter? I'm at my wits end here guys, so any help is appreciated. Thanks!
#7
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#9
There are two ways a mechanical fuel pump normally fails. The diaphragm goes or the outlet valve fails. Without a fuel pressure test you can't say anything categorically about the pump being good or bad.
If you haven't replaced the fuel filter I would do that but it sounds to me, with what you have said, that your problem is still in the carb. You must verify the proper function of the choke. Guessing is not good enough. Anytime you try cleaning the fuel system by disassembly you can dislodge debris that can then clog the very smallest ports in the carb. It sounds like the carb is not flowing enough fuel thru the jets without support from the accelerator pump.
If you haven't replaced the fuel filter I would do that but it sounds to me, with what you have said, that your problem is still in the carb. You must verify the proper function of the choke. Guessing is not good enough. Anytime you try cleaning the fuel system by disassembly you can dislodge debris that can then clog the very smallest ports in the carb. It sounds like the carb is not flowing enough fuel thru the jets without support from the accelerator pump.