Dies after running.

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May 15, 2011 | 02:11 AM

cactusbronco

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Joined: Sep 2003

Posts: 68

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From: Chandler, AZ

Dies after running.

I'm out of ideas! My '85 F150 HO dies after running it on the freeway for 10 minutes. I replaced the fuel pump, fuel filter- well it had an original brass cartridge style and I changed to a fram screw-in type. It will idle great all day long but as soon as I take it on the freeway it will bog down just like its running out of gas and I have to re-start it several times and drive at 25 mph on a surface street to get home. What is going on?

May 15, 2011 | 07:29 AM

muscletruck7379

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Joined: Apr 2003

Posts: 2,703

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From: Harrisburg, NE

how fresh is the carb? It might have a float that likes to stick. have you tried to inspect what quality of fuel is coming out of the tank? maybe the pickup is clogged.

May 15, 2011 | 10:21 AM

ctubutis

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Joined: Nov 2007

Posts: 22,415

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From: Denver Metro Area, CO

is this a computer-controlled carburetor? That sounds like limp-home mode....

May 15, 2011 | 10:30 AM

Sw1tchfoot

Posting Guru

Joined: Oct 2010

Posts: 1,199

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From: Missouri

You might be pulling air into the fuel line before the fuel pump.

May 15, 2011 | 03:25 PM

1984F-150_351HO

Mountain Pass

Joined: Aug 2006

Posts: 143

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From: CT

I would suspect your Catalytic converters if your saying its fine all day idling around town and such. I assume its quite hard to start after it shuts down on you? If its feasible unbolt the H-pipe from the manifolds and see if that solves the problem. If so its most likely the cats. Does your temperature gauge work?

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