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03-07-2019, 03:51 PM | #1 |
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1970 c10 350 dies as soon as i hit 40 mph
Ok so i just bought this truck. The vin states its a chevy c10 3/4 ton chassis. But it is the full time 4wd. It just had a transmission rebuilt before i bought it. It has the chevy 350 with a th350 behind it. I have replaced fuel filter and spark plugs (they were fouled pretty badly). I also timed the engine to a 10* advance. I was gonna rebuild the carb but i broke one of the carb mounting bolts and didnt want to risk breaking the others until i knew i could replace the whole intake and carb if i broke them all. It has brand new battery and cables as well. What is going on is at first before timing it and replacing spark plugs it would run at idle and low speeds just fine but then i would hit 25 mph and it would bog down and die. I timed it and replaced spark plugs and now i can go all the way to 40 and it just bogs down and dies. Its as if The fuel just stops sending to the carb. I dont have much experience with carbed engines and just want some more experinced opinions on what is going on.
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03-07-2019, 04:58 PM | #2 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
Sounds like the sock on the fuel pickup in the tank is plugged up. You say you replaced the filter in the carb. Sometimes someone puts an inline filter in the line from the tank to the pump. Check to see if there might be an aux. filter underneath.
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03-07-2019, 05:41 PM | #3 |
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I actually replaced the inline fileter there was no filter in the carb. And i dont think it is the stock carb either i dont know if that makes a difference, it is still a 2bbl carb.
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03-07-2019, 05:44 PM | #4 | |
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03-07-2019, 06:20 PM | #5 | |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
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But do some other things first. Disable the ignition so it won’t start when you crank it over. Pull the fuel line off the carb, stick it in a quart jar and crank it over. It should fill the jar in 30 seconds or less. Let us know how that works. Also post some pics of your motor for us. |
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03-08-2019, 10:50 AM | #6 | |
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03-08-2019, 10:57 AM | #7 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
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03-07-2019, 09:24 PM | #8 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
Could be a crack in your fuel line sucking air. I had it happen to me once on a 69 442. It would run fine at low speeds but if I brought it off the line it would go 3 or 4 car lengths and cut out.
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03-07-2019, 11:47 PM | #9 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
What carburetor, and what ignition (stock points or HEI)? There are many things that can cause this. Let's just say you creep up on 40 MPH. Does it still happen, as opposed to a full throttle run up to 40 MPH?
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03-08-2019, 10:56 AM | #10 | |
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03-08-2019, 10:51 AM | #11 | |
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03-10-2019, 04:59 PM | #12 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
That carb looks like it may not have ever been off engine, or apart. Could be part of problem...If it's had any ethanol gas run through it, that could be a problem...
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03-10-2019, 05:24 PM | #13 | |
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03-10-2019, 05:50 PM | #14 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
That might be a choice after we diagnose your problem better.
Give us some more pics. With the air cleaner off. Show us both sides of your carb. And the bolt you mentioned is broken. |
03-10-2019, 06:34 PM | #15 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
weights are stuck under the rotor and causing the motor to die out, .
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03-12-2019, 01:18 PM | #16 | |
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03-12-2019, 02:11 PM | #17 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
That missing bolt shouldn’t be a problem. There were 4 on your carb. Originally on older intakes there were only 2 bolts holding the carb on.
Sure a video won’t hurt. Your pics don’t help much. Try some that aren’t closeups. |
03-12-2019, 05:20 PM | #18 | |
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03-12-2019, 05:48 PM | #19 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
Carb swallowed some of that orange goo holding the jury-rigged air cleaner hold-down?
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03-12-2019, 06:07 PM | #20 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
Much better pics!
Some very laughable stuff you got. Carb linkage and cobbled air cleaner stud to name a couple. First thing I’d do is put in more timing. Bump it up to 15 initial. If that doesn’t improve it then check the fuel pump output. |
03-12-2019, 06:14 PM | #21 |
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Re: 1970 c10 350 dies as soon as i hit 40 mph
A can of carb cleaner would probably help a lot , Plugs ,wires,etc, . Join one of the local car clubs in your area .They could help you out with the hands on stuff .
Here are a few . https://www.google.com/search?q=+Gra...firefox-b-1-ab
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03-12-2019, 07:02 PM | #22 | |
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03-16-2019, 06:00 PM | #23 |
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So i have no idea what happened or anything but i did no other work and drove it today and it is working fine drove 55-65 just fine without bogging out
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03-12-2019, 06:57 PM | #24 | |
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