'66 L79 WARM STARTING

[Rob A.]

My engine has the original, #3367 with a Holley renew kit. Cold, with one or two pumps, the choke sets and it starts right up, warms up and the choke releases correctly. After I turn off the engine, it will start right up within about 10 minutes just by turning the key. If I wait about 20 minutes or more, and just turn the key to start it, it will keep cranking without starting, unless I put the pedal to the floor and hold it there until it starts. Assuming it is a fuel related problem, what might I adjust or experiment with to try to correct this?

[Rich G.]

Re: '66 L79 WARM STARTING

Rob

Mine acts in a similar way. Usually takes at least 1/2 open throttle to start after it is hot and sitting. I just assumed it needed more air at that moment. As you say, if you restart after only a few minutes, just hitting the key does it.

Rich G

[ronnie robertson # 36786]

Could be percolating..

Heat from the engine heating the gas in the carb and forcing fuel into the manifold causing a super-rich condition. There could be poorly sealing gaskets in the carb which leak when the carb gets hot after shutting off the engine. Mine did this; a second rebuild cured it. Does the restart exhaust indicate excessive fuel?

[Rob A.]

Re: Could be percolating..

The carb was rebuilt just a few miles ago, so I assume the gaskets haven't gone bad. I'll check for indications of excessive fuel next time I restart it hot. Wouldn't the idle vent, which is open as it should be when sitting, prevent that? Thanks...

[John H.]

Re: Could be percolating..

The idle vent on the primary bowl will relieve pressure in the float bowl, but the accelerator pump well is closest to the heat source, and when it's pressurized by expansion, it will force fuel past the check ball and out of the pump shooters.

[Rob A.]

Re: Could be percolating..

John,

Will adjusting the float level to allow less fuel into the bowl be of any help?

[ronnie robertson # 36786]

I have read that..

adjustment may help. I did not mean your gaskets were bad, but that the heat was "warping" the carb, metering block, and other internals just enough to prevent adequate sealing.

[Rob A.]

Re: I have read that..

Ronnie,

I have no external fuel leaks, so I assume everything is sealing properly.