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64 won't accelerate

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Old Aug 28, 2012 | 09:40 AM
  #1  
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Default 64 won't accelerate

64/327/300..........on the way home from a show Saturday in 90 degree sun and the car running fine at 180*. I leave the two lane road to an entrance ramp to the interstate and accelerate. The engine loses power and sputters, wants to quit and I have to play with the gas pedal to keep it going and avoid getting run over by oncoming traffic. It smooths out some so I shift to 3rd and as I accelerate again the problem reoccurs. Finally reaching interstate speed it ran fine. Each time I had to stop and then accelerate the rest of the way home it acted the same way even at lower speeds. Idled/ran fine when stopped or kept at a constant speed. What's your diagnosis boys?? Dave

Last edited by dkleather; Aug 28, 2012 at 09:53 AM.
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Old Aug 28, 2012 | 09:46 AM
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Check fuel filter and pump.
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Old Aug 28, 2012 | 10:18 AM
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Originally Posted by Frankie the Fink
Check fuel filter and pump.

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Old Aug 28, 2012 | 10:59 AM
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Originally Posted by 1snake
agree,,, if they check out, dirt in the carb needle valve...
also, a weak coil tends to act up when it gets hot...
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Old Aug 28, 2012 | 11:12 AM
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My first thought was vapor lock, but he says
Idled/ran fine when stopped or kept at a constant speed.
so that suggests it's something different.
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Old Aug 28, 2012 | 11:39 AM
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It will pay you to verify that the rubber hose from frame to pump isn't being sucked shut during moments of high fuel demand. Your symptoms are completely consistent with that possibility.

Jim
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Old Aug 28, 2012 | 09:20 PM
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Thanks for the advice guys. I'll change the fuel filter and put on my spare coil for starters tomorrow and then on to the other options if I don't have any luck. Thanks again. Dave
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Old Aug 28, 2012 | 09:21 PM
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Originally Posted by jim lockwood
It will pay you to verify that the rubber hose from frame to pump isn't being sucked shut during moments of high fuel demand. Your symptoms are completely consistent with that possibility.

Jim
Will do when I get someone to help rev while I watch. Thanks. Dave
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Old Aug 29, 2012 | 08:07 PM
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I went out today and started the car prior to checking things out as suggested above. It started and ran fine so I took it on a 45 minute run and it ran perfectly. Temp outside was 75* and not as hot as last Sat. I'm thinking now the problem most likely is the collapsing rubber fuel line between the fuel pump and frame line or the coil being weak. I carry a spare coil anyway so if it quits I'll be prepared. Fuel line didn't show signs of collapse but will be checked at the time if the problem reoccurs. Thanks for all of the help. Dave
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