hard starting

My '62 CJ5 w/ transplanted 225 V6 starts fine if I choke it and pump accelerator pedal two or three times when cold.

Then, after shutting it off, EVERY TIME IT IS RESTARTED, I have to pump the accelerator pedal two or three times. Hot, cold, anytime. It will only restart after pumping....no choke, just pumping. Why?

Thanx,
Bob in Arkansas

 

How is the idle-----smooth and proper RPM??

Or, high RPM, and dances around a bit??

Any evidence of running rich at idle??

Any whistling sound at idle??

So far, from what you have described, a vacuum leak is the first thing I thought of. This is assuming the timing and compression are good.

Basically if you have to give it a few pumps on the throttle, what you are doing is richening the air/fuel charge for the start. Two common reasons for this are idle circuits in the carb not working correctly, or vacuum leak below the carb, so the fuel is not pulled into the airstream at cranking speeds.

It does crank over well, I hope.

 

Mike,
It starts easily, runs smooth, idles good, has plenty of power... it's just that every time I jump out of the jeep (used mostly around the farm) to do something, try to start it again and crank, crank, crank, if I forget to pump pedal. Then it starts right up. Bob

 

Patrick,

Ya hafta pump it, because if I just press a little and hold, my wife always says, "uh oh, is it gonna start this time?"

Just need to remember to jump in, pump 3 times and crank. I was only wondering why.

My 2a w/ L134 is not that way. Thanks, Bob

 

By pumping the throttle, you are giving (via the accelerator pump) a shot of fuel directly into the carb throat, which then goes into the intake manifold, and sits there. The air charge in the manifold is now rich enough to fire in the cylinders when you crank the engine.

For some reason, your carb is not providing enough fuel at cranking speeds to produce a combustible mixture.

The only reasons I can think of for this, as stated above, are vacuum leak below the carb, or plugged circuit in the carb. Most carbs have an idle enrichment circuit to aid starting. Or, slow cranking speed---which causes really low intake vacuum.

Hmmmm just thought of another possibility or two-----is it really cold where you live??? I mean reallllllly cold??? Have you put in a big cam, with a lot of overlap???