MC 2100 Carb swap on Wrangler now stalls

Jones4WD

New Member
Joined
Mar 21, 2005
Location
Wake Forest, NC
87 Wrangler had stock Carter carb on it and ran good most of time but stalled at stops sometimes. After many adjustments and cleanings and performing the Nutter Bypass with no big improvement I bought an mc2100 from the guy on ebay who rebuilds them for jeeps. Jeep cranked up idled great and runs great at slow "farm path" speeds, but once you get on the highway it runs good for about 1 minute then it stats to hesitate and has no throttle response then cuts off and hard to start back and won't run hardly at all. Let it sit for a while and it has to crank over for a while till the carb bowl fill back up (it drains down over time for some reason) once cranked the symptoms start all over. I replaced fuel pump no change, replaced some vacuum lines no change, check timing and after all that I replaced the carb with another rebuilt one from the same guy and nothing changed still does same thing. Does any know what is causing this? Why would the carb bowl drain down after sitting overnight? I kept the factory style fuel filter with the fuel tank return line outlet, so I guess the gas is just draining back into the tank, but why? It seems like its starving for fuel.
 
When I swapped the carter for a mc2100 on my CJ , I used the same fuel filter since it was only a few months old. I bought a threaded hose barb for the carb, and just connected the hose off the center outlet of the fuel filter to the carb.
But you gotta figure that, normally, the ford filter threads into the carb so the carb should be able to handle the fuel pressure straight from the pump (unless something is vastly different between a ford pump and a jeep pump).
If I was having your problem, I'd go to the store and get two fuel filters (1 oem jeep, and one oem mc2100) ...if the new jeep filter doesn't work, re-plumb from the fuel pump and use just the ford filter.
Steve
 
There is probably a filter screen in the gas tank as well. All else fails, check it.
 
fuel filter is new. If I switch to a single outlet filter do I just cap the fuel return line? Also what would be causing the carb bowl to drain when it sits?
 
Jones4WD said:
fuel filter is new. If I switch to a single outlet filter do I just cap the fuel return line? Also what would be causing the carb bowl to drain when it sits?
Click to expand...

possible improper venting, and/or suction in the fuel tank?

...I might be tempted to run the fuel return line over to the charcoal canister...possible check-valve application?
 
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