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5.0 dying after two min drive

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Old Feb 6, 2026 | 12:19 PM
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5.0 dying after two min drive

1990 F150 with 5.0. Motor has had work done to it before me. swapped to a carburetor (or complete motor swap), electric fan and turned down open headers. The truck idles fine. When it goes down the road it dies after just a few blocks. It will start back up after 60minutes? This came to us as a non runner "that just needs a fuel pump" issue.

We put a low pressure pump in the tank that is identical to a pump that would be in a fuel injected 1988 model year. This truck does not have a pump or reservoir on the frame rail.

The first thought is vapor locking. The second thought is needs fuel regulator.

Any suggestions?
thank you!
Barret
 
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Old Feb 6, 2026 | 01:26 PM
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Ignition module?
 
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Old Feb 6, 2026 | 01:56 PM
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Hei distibutor took that away
 

Last edited by barrglas; Feb 6, 2026 at 02:00 PM.
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Old Feb 10, 2026 | 05:01 AM
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What is fuel pressure, at carb...when it dies check coil, may breaking down from the heat, then has to cool off again before restarting...3 things to run, spark, fuel, air.
 
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