Re: Runs great until I hit the highway?
[Re: None2Slow]
#2677216
07/13/19 11:15 PM
07/13/19 11:15 PM
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Joined: Aug 2006
Posts: 577 Michigan
Whitey Nocar
OP
mopar
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OP
mopar
Joined: Aug 2006
Posts: 577
Michigan
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Interesting. So last summer I changed the gasket on the sending unit because I had a small leak when tank was over 1/2 full. I camera’d the inside of the tank and was sure the vent tubes were hooked up backwards. I must have saw a diagram somewhere which made me think the gas was leaking from the short tube because it was hooked up backwards. Maybe I just switch them back and see what happens.
Anyone have a diagram on what vents get hooked to which tubes inside the tank. Just looked online and can’t find one... makes me wonder what I saw that made me think it was backwards to begin with
Last edited by Whitey Nocar; 07/13/19 11:17 PM.
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Re: Runs great until I hit the highway?
[Re: Andrewh]
#2677380
07/14/19 06:36 PM
07/14/19 06:36 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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hookup a can of gas in the eng compartment to the pump inlet & retry it. this'll elim everything from that point rearward.
live every 24 hour block of time like it's your last day on earth
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Re: Runs great until I hit the highway?
[Re: Whitey Nocar]
#2677411
07/14/19 08:35 PM
07/14/19 08:35 PM
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Joined: Jan 2003
Posts: 8,666 Buford, GA
I_bleed_MOPAR
master
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master
Joined: Jan 2003
Posts: 8,666
Buford, GA
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Lots of variables. As others have said, I'm thinking fuel pressure or ignition problem without actually being able to put my hands on it. Does it act up under hard acceleration on city streets? Are you getting on it hard on the freeway when it acts up or just cruising at highway speeds? Holley carb- have you checked the float levels? Many years ago I had a 340 that wouldn't go over a certain illegal triple digit speed. It would start breaking up badly. Under that number it ran fine. My Dad drove it and without me telling him anything, discovered it had a bad alternator (shame on you, Dad ). Tim
'71 Charger 383/727 '17 Challenger SXT (Wifeys car )
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Re: Runs great until I hit the highway?
[Re: Whitey Nocar]
#2677652
07/15/19 01:43 PM
07/15/19 01:43 PM
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Joined: Jan 2003
Posts: 15,268 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,268
Omaha Ne
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but points were replaced about a year ago Have you checked your dwell recently ??
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Re: Runs great until I hit the highway?
[Re: Whitey Nocar]
#2677742
07/15/19 06:38 PM
07/15/19 06:38 PM
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Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
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Swapped the vent tubes. Same issue. Saw posts about the vent tubes inside tank saying the long tube in tank should be hooked to short tube outside the tank, and the short tube in the tank to the long vent that goes up in the trunk. Anyone one know if that is indeed accurate?
This is just the original 318, automatic trans, does not have electronic ignition, but points were replaced about a year ago with new plugs and wires, does have intake and Holly 650 with headers, other than that it’s stock. Might take a look into the rear bowl on the holley if it has sat for long periods of time. My car sat for a good while with me only starting it up to idle every three or four months. With no opening of the secondaries, the fuel in the rear bowl went bad, gummed up the needle and seat (and everything else) and eventually dried out completely. Started, Idled, and ran at low RPM fine. Everything was fine until the secondaries opened and then it was all air and no fuel back there.
"The happiness of your life depends upon the quality of your thoughts" ~ Roman Emperor Marcus Aurelius
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Re: Solved. Runs great until I hit the highway?
[Re: Mattax]
#2685873
08/08/19 11:48 PM
08/08/19 11:48 PM
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Joined: Aug 2006
Posts: 577 Michigan
Whitey Nocar
OP
mopar
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OP
mopar
Joined: Aug 2006
Posts: 577
Michigan
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Thanks for the suggestions. TJP’s 1st guess was right. Turns out the fuel filter needed to be changed. Also, big thanks to Bill Meyer of Meyer’s Automotive in Howell. I described the symptoms over the phone and he said “ change your fuel filter, you’ll be all set” $5 later she’s running just fine.
Last edited by Whitey Nocar; 08/08/19 11:51 PM.
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Re: Solved. Runs great until I hit the highway?
[Re: Whitey Nocar]
#2685958
08/09/19 10:39 AM
08/09/19 10:39 AM
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Joined: Jan 2003
Posts: 15,268 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,268
Omaha Ne
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Thanks for the suggestions. TJP’s 1st guess was right. Turns out the fuel filter needed to be changed. Also, big thanks to Bill Meyer of Meyer’s Automotive in Howell. I described the symptoms over the phone and he said “ change your fuel filter, you’ll be all set” $5 later she’s running just fine. thanks for the report back, many times people just drop off once the problerm is solved. I also wanted to say that a plugged filter is usually an indication of a contaminated or rusty system. If it is rusty we do the entire system, tank, sending unit, lines, pump, and carb. IF you still have the old filter, cutting it open ( be careful of the fumes) or flushing through it backwards will normally tell one what the debris is that plugged it.
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