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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 05-07-2011, 01:54 PM
1stgenf250 1stgenf250 is offline
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Vapor Lock in a 302?

Having problems with an 87 F250 with a 302. When it's warm out the truck will run fine for about 20 - 30 minutes then it will stall. Changed distributor, coil, and computer. Does a 302 have vapor lock issues? Fuel pump maybe? It doesn't matter which fuel tank I run on, the problem persists.

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Daryn
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Old 05-07-2011, 02:09 PM
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khadma khadma is offline
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You may have in tank fuel pump issues, these low pressure pumps fail often.
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Old 05-07-2011, 02:45 PM
1stgenf250 1stgenf250 is offline
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You may have in tank fuel pump issues, these low pressure pumps fail often.

how possible is it for both low pressure pumps to fail?
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Old 05-07-2011, 09:34 PM
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Does it fire right back up or does it have to cool down first? sounds more like the Ignition Module located on the bottom side of the distributor to me.
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Old 05-08-2011, 07:08 AM
1stgenf250 1stgenf250 is offline
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Does it fire right back up or does it have to cool down first? sounds more like the Ignition Module located on the bottom side of the distributor to me.

I replaced the ICM when I rebuilt the distributor. It does have to cool down before it will restart though.
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Old 05-10-2011, 02:18 AM
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In the 90s my 88 F150 with the 302 plus dual tanks had the same issue.
I replaced all items related to the fuel system. FPR, relays, filter, Hi Press fuel pump and finally the intank low press pumps.

These pumps were easily damaged by water in the gas tank.

These LP pumps would build up enough fuel pressure to feed the HP pump, but
the lack of volume from the LP pumps would cause the truck to stall.

It may not be your problem, but it is something to look into.

And yes, both pumps failed at the same time.
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Old 05-10-2011, 02:18 AM
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1997, 302, 50, 97, cylinder, engine, f150, fixes, flathead, ford, fuel, liter, lock, stall, vapor

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