Re: Too much gas???

Posted by Glen Weilbaker on July 28, 1998 at 14:46:46

In Reply to: Too much gas???
posted by Bob Schaefer on July 28, 1998 at 14:06:17

: Before I tear into the carb, I'd like some comments or advice from the experts out there.Here's the problem.After driving my 1930 tudor for 1 1/2 - 2 hours at speeds of 48-52 MPH and stopping for 10 min to gas up, the car starts right up and about 20-30 seconds later is sputtering and backfiring with no power. If I let it run for 3-4 minutes this way the extra gas is used up and I can go on my way. I usually run the carb needle valve at 1/8 to 1/4 of a turn open, and whenever I stop the engine I turn off the gas with the tank valve and also close the needle valve. This only seems to happen after long high speed (50 mph) runs and doesn't happen while driving in town. The carb is a new reproduction Zenith.
: My theory is that with the two valves closed the gas in the float bowl expands and builds up pressure and as soon as the engine is restarted floods the carb.Should I not close the needle valve and the tank valve for these short stops?Is there something else that I need to look at?I have a theramostat in the upper radiator hose and the engine runs at l65-170 degrees steady with no boil over.What's the problem?
: Thanks in advance,Bob
Bob,
Ain't an expert but me gots a couple red ones burnin' a hole.
You describe starting a hot engine, does this happen when it is cold? From how this is stated, I assume hot.
Is the gas line too close the the exhaust manifold? Does it feel hot when you're filling up? If so you could have a vapor lock problem. This ain't per the standards but try gently bending the line away from the manifold heat. Also, do you have the drip pans? They help channel air across the area, although there is a good many cars out there that are OK with out them.
Just something to check see before digging into the carb. I be checking the float level first thing if you have to. With the car cold, gas off, pull the carb bottom half, tape up a glass jar in place of the bottom half, turn on gas and check the gas level. This may sound like a weird way but it is a for sure way to check fuel delivery and the float system.
What ever you find let the board know what you find,
Good luck,
GW

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