52 M38 Flooding

magnum · Posted: Sat Mar 05, 2011 9:32 pm Post subject: 52 M38 Flooding

My m38 is having a slight problem. I have good, spark, proper timing and it seems a fuel pressure problem. The fuel pressure seems to be inexcess and is causing the carburator to flood. It is flooding so bad ist puddles in the cylinder and comes out the carburator intake. I have had the carburator re-built so I don't think that is the issue. Any ideas would be greatly apreciated!

Zane · Member Joined: Jul 01, 2007 Posts: 158

check the float, rebuilt carbs have had to be readjusted before, it may even be hung up or stuck.

wesk · Posted: Sat Mar 05, 2011 9:52 pm Post subject:

Why did you have the carb rebuilt? Did it have a flooding problem then?

Have you checked your fuel pump pressure?
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

magnum · Posted: Sun Mar 06, 2011 9:38 am Post subject:

My Grandfather had the carb for over 30 years on the shelf so I firured it would need to be rebuilt. I will check the fuel pressure and the float on the carb and see where I am at.

Thanks,

wesk · Posted: Sun Mar 06, 2011 10:21 am Post subject:

What is the status of your engine? Just rebuilt, sat a long while, was running fine recently and then trouble?
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php

magnum · Posted: Sun Mar 06, 2011 7:40 pm Post subject:

We have been doing an off body restoration so the engine hasn't ran in about nine months. . The engine ran beautiful before we started. We had a different carburator prior(Carter non weaterproof) like those on the 2 and 3A's. Checked the float this morning and it did need adjustment. I will give the fuel pressure a check tomorrow.

TomM · Posted: Mon Mar 07, 2011 5:10 pm Post subject: stuck float

Check
1) fuel - is it more than 2 months old? change it - the fuel has gone bad and your float is sticking. This has happened to me a number of times.
2) float - be sure it does not have a pin hole and is filling with fuel. Be sure it is traveling properly, be sure it is set to the right height.
3) needle and seat - with horn off the carb feed compressed air at 5-10 psi into the fuel inlet. Be sure you can stop the flow of air when the float needle is gently seated into the seat.
4) test fuel pressure - 2.5-3psi (from memory - double check)
5) Who rebuilt your carb? I had one that the rebuilder pinched/holed the accelerator pump diaphram which causd massive flooding. Did they use modern materials or an NOS kit? If they used an NOS kit the modern fuel has eaten away the rubber and your diaphrams are leaking fuel into the wrong places.
6) vacuum leaks - check with vacuum gauge. vac leaks will sometimes cause pumping of the accelerator pump and flood the engine.

If you have very wet plugs you may have to pull the carb and sponge out the intake manifold.
Also, if you think the engine has "massively" flooded you may want to disconnect the exhaust pipe at the flange below the head pipe. fuel will pool right there and pour out when you crack the joint.

magnum · Posted: Fri Mar 11, 2011 10:55 pm Post subject:

The float was stuck up. carb is working great now. Thanks for all of the help!


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