My Carb hates me

arthur.m · Post by **arthur.m** » Wed Jul 19, 2006 11:02 pm

Finally my 352 is road legal and have seen some action again. Just had the first long test drive to a historic vehicle meeting maybe 50 miles away. The truck had what I think was a vapour lock when I was driving there last Saturday. It cured itself after waiting for a while so it was no big deal. Yesterday I drove her back and then the problems began. The engine began running badly when driving uphill, it almost died, the revs went up and down. The idling was ridiculously nervous, pressing the gas pedal almost choked the engine.
After cooling down, the engine would work almost normally for a while, but the next hill would make the engine cough again. And I think there is a mechanical noise connected to the bad running, like something has come loose inside the Carb or Governor.
I would be very grateful if You have any suggestions. I'll probably have to take the Carb apart, but how far can I go with my basic tools and knowledge?

Greetings, Arthur

dr deuce · Post by **dr deuce** » Thu Jul 20, 2006 5:38 am

A couple quick fixes:

Take some heater hose and slice it down the side. Cut it to lengths to fit over the fuel line coming from the pump to the carb. It does not have to be perfect and cover every inch. You just want to insulate most of the line.

When you get it running, let it warm up a bit then (under the hood) hold the throttle wide open and as the rpms climb up towards the top end, put you hand over the carb. As the engine dies down, remove your hand before it stalls giving it enough time to recover whicle still holding it wide open. What you will do is create a suction in the carb and possibly suck any small particles thru the carb. This works quite well for small stuff. Don't let the engine stall.... Let the engine go back to idle after

armydriver · Post by **armydriver** » Thu Jul 20, 2006 7:20 am

Thanks Doc I will try that as I am having carb problems myself currently. I have bought a new tank from VOV and a T2 filter in hopes of solving part of the problem with small particals of rust.
arthur.m , it could also be a coil going bad on you if it has not been replaced recently. I had that problem last year. The truck would run slower then start cutting out then stall. After sitting for a while it would start up and run fine for a little while and then the same problem. I replaced the coil and the problem was solved. I now carry a spare coil in my parts box.

arthur.m · Post by **arthur.m** » Thu Jul 20, 2006 10:55 pm

Thanks Doc and AD, very interesting points. I will see if I can deal with the problem this weekend. The coil indeed is a little suspect, it's a German item fitted in Norway. I will change the spark plugs too, it now has Nippon plugs fitted by the prewious owner. I will try to clean the carb, hopefully I don't need to take it to parts.

Arthur

UK Jack · Post by **UK Jack** » Fri Jul 21, 2006 7:02 am

Guys

I think it would makes sense to fit a couple of inline filters as standard, they only cost a couple of $'s and can help save a lot of hassle - that said, I haven't any but I will do during the winter but when I took my tank off to paint it I washed the tank out then dried it out with an hot air gun and the used a hoover to suck up all the junk......which believe it or not weighed in just under 2lb

dr deuce · Post by **dr deuce** » Fri Jul 21, 2006 8:04 pm

All my HMVs have one inline filter in front of the (electric) fuel pump and one after...

Fernando Mendes · Post by **Fernando Mendes** » Sat Dec 30, 2006 5:57 pm

When I was restoring my truck,the engine began to fail(kill).Were the hydrovacum tube that was sucked.

Regards.

KEVINABR · Post by **KEVINABR** » Sun Dec 31, 2006 4:54 am

Good advice from the doc

armydriver · Post by **armydriver** » Sun Dec 31, 2006 7:59 am

I have placed an inline glass fuel filter between the fuel pump and close to the carburator. Not only this insure no particles will get to the carb, the glass filter allows for seeing the amount of fuel flow from the fuel pump to see if there is any blockage along the fuel route.

Miner Matt · Post by **Miner Matt** » Sun Dec 31, 2006 2:54 pm

If you do put in a glass fuel filter make sure it is not to close to the exhaust manifold or anything it can bang against and brake and spill gas on the exhaust. I know of a truck that caught on fire form this.

Capt Lee P · Post by **Capt Lee P** » Tue Jan 02, 2007 6:52 pm

Hi

I agree with Doc. I have enclosed my metal fuel line with rubber hose between the fuel pump and the carb. I also placed a clear plastic fuel filter right next to the carb. Works great, as I once had a vapor lock problem especially as I live in a warm climate.

Lee

armydriver · Post by **armydriver** » Wed Jan 03, 2007 7:14 am

I have my glass fuel filter inline right in front of the carburator, easy to see and in no danger of banging against anything. The glass on this filter is about as thick as the glass on the fuel pump.

The GMC CCKW

My Carb hates me

My Carb hates me

Engine running badly.

Fuel Line