Help 79 f250 won’t stay running

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05-04-2018, 08:31 AM

Timbid

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Help 79 f250 won’t stay running

so when I start my truck up in the morning it runs for a good minute but then when it’s warmed up it dies. Any ideas what it is?

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05-04-2018, 04:15 PM

kermmydog

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Not to be a wise guy but fuel, spark & air. Which one quits when it dies. Is it a stock engine 351M or 400 were the engine options for 79.

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05-04-2018, 05:17 PM

Timbid

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No it’s stock 460 the towing option for the year and yes I know the three. There’s spark and I think I was able to diagnose it to a fuel issue. There may be a jet or port that is clogged starving the engine. Going to pull the carb off again and re clean it. A little more in depth

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05-05-2018, 07:37 PM

kermmydog

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If it has a mechanical fuel pump hook a vacuum gauge between the tank & pump You should have vacuum to pull gas to the pump. Then check Fuel pressure between pump & carb. Try dumping some SeaFoam or the Super Tech (Walmart Brand cleaner that is the Seafoam at Walmart Price about $2 cheaper than name brand.)

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05-05-2018, 11:14 PM

Timbid

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so it has an electric pump but I think I found the reasons for the issue. The was a bent step up rod

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05-06-2018, 04:01 PM

kermmydog

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That is great you found the issue.
Do you have an aftermarket Electric pump external or is it in tank?
I have had more issues with FORD in tank ELECTRIC PUMPS than all others.
I have found DELPHI electric pumps are the best.

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