Joined: Dec 02, 2006 Posts: 115 Location: Bloomfield, New Jersey
Posted: Sun Aug 12, 2007 5:32 am Post subject: Engine Stalling Problem
Gentlemen: I started having a problem with my M-38 stalling when I came to a stop. I was returning from a show last week and upon exiting the main road my jeep stalled at the stop sign/intersection. It started right up again, but I had to pull out the throttle a bit to keep it from stalling again if I stopped. It ran fine when I was moving. I started it up again last night to go to another cruise night. It stared up fine and idled fine when I left my house. When I got to the show ( approximately six miles away it started to stall again when I stopped for a light. At the cruise night I met someone who came with a M-37 truck. I told him about my problem and he told me that other military vehicle owners in our club, including him, were having the same problem. He said that a lot of guys had to pull the throttles out on their vehicles to keep them from stalling at slow speeds i.e. parades. He told me that the problem is the new formula gasoline which contains 10% alcohol. He said that he had spoken to several classic car mechanics who told him the same thing.
Anyone else having the same problem, or is it only the great "cheap gas" we have in Jersey???? Regards, Dennis
I had something similar happen to me it was a clogged vent line causing a vapor lock, replaced the sender and all was fine... The sender had a very dirty valve...
Both my road going jeeps run OK on poor-ish quality fuel and our bio fuels. Sadly I have to avoid the free avgas from the local airfield!!
I did have this problem when moisture in the oil evaporated and was sucked into the intake manifold, until the cranckcase was 'dry'.
In general I find older vehicles Dodge WC series, Jimmys, jeeps, more forgiving of varying quality fuel.
I would be carrying out a general ignition/fuel and mixture/service check and looking at the gaskets around the manifolds and carb incase one has a crack that opens up when hot.
BTW have you checked the fording valves are set correctly, accidently closing the crackcase vacuum valve can have very odd results if you don't realise its in the wrong position. ie engine shuts down at tick over but will run with some throttle. (Well mine does anyway)
Cheers,
Dave
If you open up your floatbowl on the carb, are there any tiny particles in the bottom? (It is amazing at how tiny a particle will cause problems at the needle valve) If so, it indicates that particles, likely from the fuel tank, are bypassing the coarse fuel filter in the tank, and finding their way in to the float needle valve of the carb.
Best solution I have found is to install an inline fuel filter. If installed before the pump, you may want to clean the particles out of there too. The flex line before the pump is a common place to install a filter. You can also install one right before the carb.
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Regards, Dennis
I checked and tightened up on the carborator and vaccum lines, increased the idle a bit and she's running like a top!! Thanks again.
