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Jul 21st, 2025 | | | | Joined: Mar 2012 Posts: 240 'Bolter | | 'Bolter Joined: Mar 2012 Posts: 240 | Hi all,
My truck is a '47 3100 with the original 216. The carb is a Carter W-1 (574s, I think). I've had some carb issues, but am plugging my way through them. One of the things recommended was to confirm float level: done 1/2" seated and ~ 1" "hanging open". After this adjustment, no change in the performance wrt taking choke, so this can be ruled out.
When driving the truck, or just running it, it backfires when I stab the throttle (one pop, relatively light, the wipers jump). Less aggressive throttle application causes no issues.
I'm not prone to think the carb can cause a backfire. What is the best course of investigation? Timing? Overhead re-set?
Thanks for [all] the help.
Bill
1947 3100 Advanced Design
Never, never, never, never give up. - Churchill
| | | | | Joined: Mar 2013 Posts: 176 Shop Shark | | Shop Shark Joined: Mar 2013 Posts: 176 | I'd start looking for an intake or exhaust manifold leak? Let the motor idle and spray some starter fluid lightly around and see if the idle picks up anywhere. | | | | | Joined: Oct 2002 Posts: 4,066 Bolter | | Bolter Joined: Oct 2002 Posts: 4,066 | could be a fuel issue, dumping to much ,,,
seems like most are caused by ignition type, timing,
crack or loose dizz,etc
Redryder pixMy HotrodA veteran - whether active duty, retired, national guard, or reserve - is someone who, at one point in his or her life, wrote a blank check made payable to The 'United States of America', for an amount of "up to and including my life."I am fighting cancer and I am winning the fight | Pain is part of life; misery is an option. | | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | Sounds like a momentary lean situation. The accelerator pump isn't supplying a enough of a squirt of gas to make up for all the air when the butterfly is opened suddenly.
Make sure the piston seal is OK. Make sure the passage from the bowl to the pump bore is not full of gunk. Make sure the one way ball is free and clean. Make sure all of the linkage is adjusted correctly and not worn. 1/16" slop at each linkage point = 1/4" reduced piston stroke and a fraction of a second late piston movement.
| | | | | Joined: Apr 2013 Posts: 101 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2013 Posts: 101 | I agree with Jim. Although I also had a bad plug, I experienced a similar problem that went away when I rebuilt the carb. And I had a very "weak stream" when I opened the throttle. | | | | | Joined: Mar 2012 Posts: 240 'Bolter | | 'Bolter Joined: Mar 2012 Posts: 240 | Thanks guys.
I will have to concede that rebuilding a carb successfully seems to evade me. I'll get it done by a pro this time.
I'll keep you posted on progress.
1947 3100 Advanced Design
Never, never, never, never give up. - Churchill
| | | | | Joined: Aug 2005 Posts: 6,383 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,383 | Agree with Jim as well. Pull the top of the filter housing & actuate the throttle linkage. If you don't see a good strong stream of fuel from the accelerator pump you likely found your problem.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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