Hard Starting 350

[Classics Fan]

Originally Posted by 72peace

Seeing your location it's probably cold outside, without a manual choke it's gonna be a hard start. Mine usually has trouble with anything lower than freezing, never use ethanol, i use premium since most stations have it. I also switched to a redtop battery, it helped a lot on cold mornings. My previous truck had a headbolt heater, it worked wonders, debating using one on this truck. Hope this helped.

Cheers,
Nathan

Hey Nathan. No choke on this carb, just the factory manual throttle I use to set high idle for warm up after starting. It’s not cold here, 40* +. I’ve owned the Jimmy since late 2016 and it normally starts right up after a couple of crank cycles regardless of ambient temperatures. The hard-start problem has gotten gradually worse over the past several weeks. I spent 10 minutes cranking and pumping the gas yesterday before posting looking for help.
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[Ziegelsteinfaust]

Q-jets are a bit famous for leaking back since the inlet is on the bottom of the carb vs the top like a Holley.

I forget what it's called but there's a filter with a check valve that helps fix the problem.

My friend had this problem so bad he went with a electric fuel pump. Even after a few attempts at repairs. His was a DD, and would leak back in as little as a hour.

[72peace]

Originally Posted by Classics Fan

Hey Nathan. No choke on this carb, just the factory manual throttle I use to set high idle for warm up after starting. It’s not cold here, 40* +. I’ve owned the Jimmy since late 2016 and it normally starts right up after a couple of crank cycles regardless of ambient temperatures. The hard-start problem has gotten gradually worse over the past several weeks. I spent 10 minutes cranking and pumping the gas yesterday before posting looking for help.
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If I recall the quad has two fuel filters one line filter you may see gas running through and the other is an internal where the fuel line goes into the carb, they're both a cheap easy replacement I would recommend replacing both. then check your vacuum lines for cracks and leaks, had that issue once. If good go to points, plugs, condenser old school tune-up, may be starting to foul. Missed the HEI, nvrmind on the last item.

Cheers,
Nathan

[Classics Fan]

I’m listening and considering all the responses. I failed to mention the last time it was started was about a week ago. It wouldn’t start so I replaced the inlet fuel filter. I didn’t know there was a second one until now. In any event it started and ran almost immediately. I let it warm then turned it off. It started immediately and continued to whenever I tried over the following few hours. That leads up to yesterday when I posted about my problem.

I’m attaching pictures as previously requested.
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[Classics Fan]

Update: with the help of a 1- second spray of starting fluid Ingot it started, running and warm. It starts right up after sitting an hour or so. I’ve ordered the Quadrajet manual and am preparing to learn all about what I’m experiencing. Thanks for all the input.
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