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!
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.
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
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.
Joined: Apr 18, 2005 Posts: 458 Location: Rhode Island
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.
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