Stalls when driving after 15 to 20 miles at highway speed of 55, starts right up again in neutral

ARNIEW

MEMBER
1971 ALL OTHER MAKES ALL OTHER MODELS
6.7L
V8
RWD
AUTOMATIC
75,389 MILES

Stalls after 15 to 20 miles on the highway, starts again right away in neutral, began after a stop at BP and so changed out fuel pump and filter, same problem, before this started, blowing fuses when turning on hazard lights, and no front left turn signal or rear right either, also appears to have been rewired to some degree looking under the dash, prior to this the alt fuel tank switch quit working and the gen start switch stopped working, help we are stuck at a truck stop 80 miles S of Cleveland Ohio and need to get home to Oregon, seems to run OK besides this can cruise around town at 35 and below during the day. Then again not driving 15 to 20 minutes or miles in town so may not have anything to do with problem.

3 Replies

CARADIODOC

MECHANIC
33,858 POSTS

Need a little hint as to what kind of car this is.

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Monday, June 22nd, 2015 AT 11:47 PM

ARNIEW

MEMBER
2 POSTS

This is a 71 Winnebago with dual tanks aux not working with a 4 barrel carb
and a dodge drivetrain, hope this helps

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Tuesday, June 23rd, 2015 AT 6:03 AM

CARADIODOC

MECHANIC
33,858 POSTS

Dandy. For the first problem, the best suspect is the pickup screen inside the fuel tank. They collapse and block flow, then stretch out again and pass fuel after sitting a few minutes with the engine off. You have the luxury of running on the second tank if you can get switched over to it. That will tell you right away if it's a plugged screen. I had this happen on an '80 Volare, a '78 LeBaron wagon, and twice on my '88 Grand Caravan.

I can't tell you what is wrong with the wiring, but I can help with blowing fuses. A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.

For intermittent problems like yours the bulb may be dim already. Watch what takes place when it gets bright. That's when the short is occurring. It could be due to the rocking of the engine when you shift between reverse and drive. It could be due to the body flexing when you drive over bumps in the road. The bulb limits current to a safe value when the short occurs, in this case about one amp.

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Thursday, June 25th, 2015 AT 12:35 AM