looking for help
Tuned
Joined: Jun 2018
Posts: 458
Likes: 123
From: Arkansas
Ok, that's a pretty key piece of information when you're saying it needs the choke to run (like someone else said that means your mix is lean) and the idle mixture screws have no effect. It sounds like a huge vacuum leak, could be internal to the carburetor. Who rebuilt it?
Hotshot
Joined: Feb 2004
Posts: 10,764
Likes: 2,590
From: The Shenandoah Valley
Fleet Mechanic
Joined: Jul 2017
Posts: 1,448
Likes: 163
From: East Texas
When was it last tuned up? If unknown, I would start with a basic tune up. Plugs, wires, cap, rotor, fuel filter etc... and go from there. I bet the link to 4WD is merely coincidental. Shift it into 4WD and see if it starts. The shift linkage could be causing something to short. I doubt it, but you never know.
Laughing Gas
Joined: Jan 2014
Posts: 1,076
Likes: 500
From: Kenai
Since this truck is new to OP, he should check that gear ratios front and rear are the same. It's possible they are different and that is binding up the drivetrain, causing a poor running truck to die.
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5th Wheeling
Joined: Jan 2023
Posts: 27
Likes: 1
From: IDAHO
Ok, that's a pretty key piece of information when you're saying it needs the choke to run (like someone else said that means your mix is lean) and the idle mixture screws have no effect. It sounds like a huge vacuum leak, could be internal to the carburetor. Who rebuilt it?
FTE Legend
Joined: Nov 2015
Posts: 30,876
Likes: 4,116
From: Angier, NC
I have not gone thru all the post was this truck sitting for a bit?
If so it could be bad gas left in the tank(s) and or rust that has not made it to that rebuilt carb.
And dont tell me "it has a gas filter" as fine rust dose make it past it into the carb.
Dave ----
If so it could be bad gas left in the tank(s) and or rust that has not made it to that rebuilt carb.
And dont tell me "it has a gas filter" as fine rust dose make it past it into the carb.
Dave ----
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5th Wheeling
Joined: Jan 2023
Posts: 27
Likes: 1
From: IDAHO
also when i say overhaul i mean i cleaned the ventturi the jets made sure all passages where free by puting pressurized air into it. replaced all the diaphragms, seals and the needle and seat and flout though when i was putting on the carb back on the truck it has this bottom vacuum piece a seal/spacer. the new seal and spacer did not fit so i kept the old one. because it was still in good shape
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5th Wheeling
Joined: Jan 2023
Posts: 27
Likes: 1
From: IDAHO
i cleaned out the plastic saddle tank before running on the tank replaced the fuel pump rubber gas line and fuel sender unit. and the gas would only be about a month old even so i put fresh gas into it before starting her up because she was low.
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5th Wheeling
Joined: Jan 2023
Posts: 27
Likes: 1
From: IDAHO
Hotshot
Joined: Feb 2004
Posts: 10,764
Likes: 2,590
From: The Shenandoah Valley
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5th Wheeling
Joined: Jan 2023
Posts: 27
Likes: 1
From: IDAHO
another thing is the plunger diaphragm literally was going out the other end when i took the master cylinder off
Lead Driver
Joined: Jul 2017
Posts: 9,580
Likes: 1,162
From: San Jose, CA
Luckily your replacement seemed to fix the old issue. But even new (where did you get it and was it the cheapest by any chance?) it still does not hurt to verify.
So if you have not done so already, maybe remove the vacuum hose from the booster or the intake and plug the hose or port to isolate and eliminate that from the mix.
It can't hurt, and it only takes a few minutes. And that way at least you'll know.
Unless you've already done it, it's worth it.
And I'm serious about not trusting new parts anymore. We used to be able to just assume that a new part was good, and that if the problem did not go away then it must be something else.
Nowadays however, replacing parts just adds more possible trouble points you have to test and re-test to be sure that the new part is not a new part of the problem.
Paul