Trying to help a fellow RV'er, 1996 class B Airstream 460 FordNew fuel pump installed 5 yrs ago, never a problem till 6 months ago.Quits running,....hi speed, low speed, even idling at times,....no set pattern.The one thing that is consistent,....it will always restart, but only after waiting about 20 minutes or so.It has been in a shop twice for this problem.1st time, replaced the "ignition module".....didn't fix the problem2nd time, searched to find "nothing wrong" A month later quit again at hi speed. It has quit twice in a day, but seldom.Any ideas will be greatly appreciated.

First things that come to mind: vapor lock(is it hot?) and fuel filter(in tank or on the rail).

collapsing fuel line ?i had an AMC hornet, that developed a crack in rubber fuel line between tank and steel tubing lineit did not leak fuelit would draw air instead of fuel, {NO intank pump} and stop running at inconvenient moments

Someone on you tube had a similar problem, turned out to be a clogged exhaust/muffler

On my older German cars with Bosch CIS mechanical fuel injection, your symptoms were often caused by a tired/failing fuel pump relay or failing fuel pump itself. Electric (in tank) fuel pumps often get noisy (growling) before they fail.Chum lee

Vapor lock is a thing of the past, with high pressure fuel pumps in the tank. With bypass fuel pressure regulator, the fuel is always in motion and doesn't over heat.Those old Fords were world famous for intermittent fuel pump problems. The problem was more prevalent when the tank was below half full. Get a fuel pressure gauge and connect it to the fuel rail. Then you will know if the fuel pump is faulty. The tricky part is figuring out how to observe the pressure gauge while in motion.Richard

(UPDATE) 460 Ford Quits Running......But always restarts

16 Replies

MEXICOWANDERER
Explorer
Jul 17, 2017
If testing fuel pressure does not yield the problem...

Remove DISTRIBUTOR pickup coil or put the whole damned distributor into an oven minus cap and rotor. Set oven for 250 degrees and no higher.

Bake for 30 minutes.

What is the resistance across the pickup coil wire leads? Compare the value to ohms at room temperature.

A bad pickup coil harness connector will also cause this. One hand on one side of the connector the other on the other side. Pull GENTLY. Any change?
RLS7201
Explorer II
Jul 17, 2017
Vapor lock is a thing of the past, with high pressure fuel pumps in the tank. With bypass fuel pressure regulator, the fuel is always in motion and doesn't over heat.
Those old Fords were world famous for intermittent fuel pump problems. The problem was more prevalent when the tank was below half full. Get a fuel pressure gauge and connect it to the fuel rail. Then you will know if the fuel pump is faulty. The tricky part is figuring out how to observe the pressure gauge while in motion.

Richard
Chum_lee
Explorer
Jul 17, 2017
On my older German cars with Bosch CIS mechanical fuel injection, your symptoms were often caused by a tired/failing fuel pump relay or failing fuel pump itself. Electric (in tank) fuel pumps often get noisy (growling) before they fail.

Chum lee
suprz
Explorer
Jul 17, 2017
Someone on you tube had a similar problem, turned out to be a clogged exhaust/muffler
MrWizard
Moderator
Jul 17, 2017
collapsing fuel line ?

i had an AMC hornet, that developed a crack in rubber fuel line between tank and steel tubing line

it did not leak fuel
it would draw air instead of fuel, {NO intank pump} and stop running at inconvenient moments
1995brave
Nomad
Jul 17, 2017
First things that come to mind: vapor lock(is it hot?) and fuel filter(in tank or on the rail).

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(UPDATE) 460 Ford Quits Running......But always restarts

16 Replies

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