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'72 270 w/ 413 - Intermittent Power Loss

Unread postby broomeju on Tue May 22, 2018 8:55 am

I have been chasing a problem that has me scratching my head.
The engine will lose power.
It will not stall completely but it will only idle.
If I get off the gas for about 10 seconds and then get back on it again it'll run well for several more hours.
it never happens out on the road when cruising (even when going up long hills when engine systems would seem most "stressed")

It appears to only happen when:
1) the engine is hot
2) the engine has been running at load but then have slowed to an idle (ex. stopping to get gas/lunch/errand)
3) typically happens when accelerating but sometimes happens under light load, too

What I've done:
1) cleaned fuel tank and lines and installed fuel/water separator (like on a boat - quart size filter element)
2) installed new mechanical fuel pump
3) rebuilt carb (Holley - set fuel levels, etc.)
4) replaced old coil with new one ( this one did not require ballast resistor)
5) cleaned ground where ECM unit mounts

Any ideas what to check next ?
broomeju
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Re: '72 270 w/ 413 - Intermittent Power Loss

Unread postby 77Travco on Tue May 22, 2018 9:27 am

Do you have an EGR valve? Mine was hanging open at times when coming to a stop and caused an engine stall. I ended up blocking it off.
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Re: '72 270 w/ 413 - Intermittent Power Loss

Unread postby broomeju on Tue May 22, 2018 9:51 am

Nope, no EGR valve on this old girl.
Thanks for the suggestion!
I can not tell you how much I appreciate the assistance received from this forum.
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Travco Model: 1972 D270 413

Re: '72 270 w/ 413 - Intermittent Power Loss

Unread postby dirtydeno on Tue May 22, 2018 4:17 pm

This sounds to me like you are boiling gas in the carb or in the gas line. Check your gas line and move it away from heat. At load (driving) you are moving enough gas that it dose not boil but when you slow down the lower volume of gas heat soaks and boils.
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Re: '72 270 w/ 413 - Intermittent Power Loss

Unread postby 77Travco on Thu May 24, 2018 9:56 am

Do you run an electric fuel pump near the tank to push the gas up to the mechanical pump?
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Re: '72 270 w/ 413 - Intermittent Power Loss

Unread postby broomeju on Fri May 25, 2018 2:16 am

Thanks so much!!!!!

Steel fuel line between mechanical fuel pump and carburetor was touching water pump body,etc.

Pulled fuel line up and away from hot surfaces, wrapped in with split open old water hose and problem is gone.
broomeju
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Travco Model: 1972 D270 413

Re: '72 270 w/ 413 - Intermittent Power Loss

Unread postby dirtydeno on Fri May 25, 2018 8:58 am

No problem glad to help!

broomeju wrote:Thanks so much!!!!!

Steel fuel line between mechanical fuel pump and carburetor was touching water pump body,etc.

Pulled fuel line up and away from hot surfaces, wrapped in with split open old water hose and problem is gone.
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