Re: [MV] M37 Carb Probs

R. C. Orpe (sgtorpe@sierranet.net)
Sun, 8 Mar 1998 07:21:10 -0800

Mike,
Check to see if the fuel flow is still routed through the mechanical fuel
pump on the side of the block. If fuel is getting in to the oil the
diaphragm is probably shot and the pump should be bypassed or replaced. As
I recall, NAPA has a suitable replacement pump. One of the problems running
the new oxygenated fuels in the old systems is that it eats up the rubber
seals and diaphragms. The old gas 5 tons are really prone to this and need
to be watched carefully. On a diesel engine fuel in the oil means an
injector pump rebuild/replacement, which AIN'T CHEAP!
If the engine is running rich, first make sure that the choke flapper in
the carb is actually opening all the way. If so then you probably need to
rebuild the carberator, especially the needle and seat that controls the
fuel level in the float bowl. Sometimes it is as simple as cleaning out the
crap that has accumulated in there.
Happy Motoring
Randy Orpe

----------
> From: mtowers@netxpress.com
> To: mil-veh@skylee.com
> Subject: [MV] M37 Carb Probs
> Date: Saturday, March 07, 1998 9:40 PM
>
> Ok Guys, Here's a Puzzler for You:
> I recently bought a 52 M37 on which the previous owner installed an
> electric fuel pump. Seems like a good idea, except that the engine runs
> rough, like the choke was constantly full out, and worse, fuel is
> migrating into the oil pan.
>
> One mechanic says that the fuel pump is producing too much pressure, and
> that it needs a regulator. Another mechanic says that the carb needle
> valve and seat is not working properly, and all it needs is some carb
> work.
>
> Ok list, what do YOU GUYS think?
>
> Thanks in advance for your help and advice.
>
> Mike T.
> M37 et al
>
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