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Old 05-22-2011, 04:44 PM
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Car lurching up hills at highway speeds

Hello, I have a 55 Chevy with a 283 engine and a 350 turbo trans. Today while driving at 70 mph on a long trip the car started lurching and lost power while climbing hills. Not sure what is going on? I would sometimes shift into neutral and then back into drive. Once I had to pull off the road. Only seemed to do it on hills at highway speeds. I do not have a separate trans cooler and fluid is full and clear. Could it be the fuel pump? Fuel filter? I need some help b/c I want to drive this thing to Dallas next weekend.

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Old 05-22-2011, 05:49 PM
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What fuel-pump do you have on it mechanical or elec ? I had this same thing happen and it was my fuel pump (mechanical pump) i replaced it and have had no more problems.



Cole
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Old 05-22-2011, 06:12 PM
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You ran to the computer before you even checked the fuel filter? I'd of had it out right there beside the road, and also cranked it to see what kind of delivery the pump had. Then go from there.
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Old 05-22-2011, 06:22 PM
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Quote:
Originally Posted by willowbilly3
You ran to the computer before you even checked the fuel filter? I'd of had it out right there beside the road, and also cranked it to see what kind of delivery the pump had. Then go from there.
HaHaHa!!!!!!!!!!!!!!!!! i will have to agree it is probably the filter or the fuel-pump or both.



Cole
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Old 05-22-2011, 06:23 PM
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Quote:
Originally Posted by eloc431962
What fuel-pump do you have on it mechanical or elec ? I had this same thing happen and it was my fuel pump (mechanical pump) i replaced it and have had no more problems.



Cole
Mechanical pump. I thought of that, but could not understand why it only did it going up hills at highway speeds. It has been a while since I had a hot rod, but I thought a fuel pump would fail totally not just on hills.
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Old 05-22-2011, 06:25 PM
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Quote:
Originally Posted by willowbilly3
You ran to the computer before you even checked the fuel filter? I'd of had it out right there beside the road, and also cranked it to see what kind of delivery the pump had. Then go from there.
Sure did, b/c I am no expert and needed your advice. Will be changing it tomorrow. Not sure how to check flow?
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Old 05-22-2011, 06:27 PM
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Quote:
Originally Posted by Rhino42
Mechanical pump. I thought of that, but could not understand why it only did it going up hills at highway speeds. It has been a while since I had a hot rod, but I thought a fuel pump would fail totally not just on hills.

No they can do exactly what you are describing, but as stated check the fuel filter first then go to the pump. JMO i have seen more then one mechanical pump do this on hills or under heavy acceleration.


Cole
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Old 05-22-2011, 06:47 PM
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Thanks, I will replace the filter and go from there. Much cheaper than getting the trans looked at, b/c I know nothing about them.
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Old 05-24-2011, 04:28 PM
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Originally Posted by eloc431962
No they can do exactly what you are describing, but as stated check the fuel filter first then go to the pump. JMO i have seen more then one mechanical pump do this on hills or under heavy acceleration.


Cole
Ok, new fuel pump and filter and took it for a ride today. Exact same problem, accelerating and loose power/lurching. Any new ideas?
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Old 05-25-2011, 07:00 AM
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Quote:
Originally Posted by Rhino42
Ok, new fuel pump and filter and took it for a ride today. Exact same problem, accelerating and loose power/lurching. Any new ideas?
I have never had a th350 act this way myself not saying that they won't do this, but i still think it's fuel related.JMO


Cole
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Old 05-25-2011, 08:05 AM
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How old is the tank and sending unit? It definitely sounds like a fuel delivery issue, it could be the sock filter on the sending unit is plugged. Good luck and hope you find the issue.
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Old 05-25-2011, 06:56 PM
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What kind of air filter are you running. I saw this not long ago with one of those tiny chrome air cleaners. It was restricting air flow and acted just like it was running out of fuel.

One other item is float level.
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Old 05-25-2011, 07:51 PM
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Quote:
Originally Posted by Underpowered64
How old is the tank and sending unit? It definitely sounds like a fuel delivery issue, it could be the sock filter on the sending unit is plugged. Good luck and hope you find the issue.
Actually the tank is only a few years old and just put a new sending unit in it 4 months ago b/c the gas gauge was not working.
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Old 05-25-2011, 07:53 PM
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Quote:
Originally Posted by T-bucket23
What kind of air filter are you running. I saw this not long ago with one of those tiny chrome air cleaners. It was restricting air flow and acted just like it was running out of fuel.

One other item is float level.
Good point, I just replaced the air filter in preparation for this trip. It is a large 9 inch in diameter filter, Fram is the brand name.
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Old 05-25-2011, 07:57 PM
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So I have been looking for another source to the problem and see that my fuel line gets within an inch of the exhaust pipe at the bottom of the firewall and frame. Do you think that has anything to do with it? I will try some pipe insulation to see if that does anything. And I will try taking the air filter off just for a short drive. What about 10% Ethanol Gas, does that have any effect on old engines?
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