05-10-2012, 06:45 AM
I replaced my engine in my 73 mach with a 351W crate back around 2001 or 02. She was running great, but after 4 cross country moves and sitting for 7 years the gas became bad and I had other issues to contend with (electrical etc.) Anyway, one step at a time I replaced the fuel filters, spark plugs, rebuilt the carb (edelbrock #1411 750cfm electric choke...I know probably too big), fuel pump (b/c fuel wasn't going to carb) and just recently I've replaced the fuel tank (rusted, old varnished fuel & leaking). Clean fuel is now showing up into the carb with good pressure.
The problem I'm having is bogging mainly when I have it in drive and put a load on it. She wants to sputter and bogs down, so I have to slowly press on the accelerator and wait for her to catch up. Once I get moving it's fine, but I'd rather not stop b/c the process starts again.
I've set the linkage for the accelerator pump as close to the shaft as it can go. The further away, the worse it seems. I've also bent the linkage a bit, but nothing helps. It looks like plenty of fuel is sprayed when I rev it up. Measurements on the floats are according to edelbrocks specs-7/16" upside down & 15/16" with floats hanging down. I've also turned the distributor c/w and cc/w thinking it was timing but that doesn't seem to have an effect. I don't seem to have any vacuum leaks. (I've sprayed carb cleaner around the carb while running but she doesn't rev up)
I've taken the carb apart a couple times now. BTW The drivers side idle screw has no effect when I turn it. Blew it out a couple times, but nothing. Passenger side works fine. To me the problem points to the accelerator pump, but anything I do doesn't have any affect. The new spring that came in the rebuild kit was much softer, so I put the old one back in. It didn't matter...
I'd rather not buy another carb even if 750 cfm is too large. I would greatly appreciate any thoughts or advice here...I can take pictures if needed.
The problem I'm having is bogging mainly when I have it in drive and put a load on it. She wants to sputter and bogs down, so I have to slowly press on the accelerator and wait for her to catch up. Once I get moving it's fine, but I'd rather not stop b/c the process starts again.
I've set the linkage for the accelerator pump as close to the shaft as it can go. The further away, the worse it seems. I've also bent the linkage a bit, but nothing helps. It looks like plenty of fuel is sprayed when I rev it up. Measurements on the floats are according to edelbrocks specs-7/16" upside down & 15/16" with floats hanging down. I've also turned the distributor c/w and cc/w thinking it was timing but that doesn't seem to have an effect. I don't seem to have any vacuum leaks. (I've sprayed carb cleaner around the carb while running but she doesn't rev up)
I've taken the carb apart a couple times now. BTW The drivers side idle screw has no effect when I turn it. Blew it out a couple times, but nothing. Passenger side works fine. To me the problem points to the accelerator pump, but anything I do doesn't have any affect. The new spring that came in the rebuild kit was much softer, so I put the old one back in. It didn't matter...
I'd rather not buy another carb even if 750 cfm is too large. I would greatly appreciate any thoughts or advice here...I can take pictures if needed.