M5 dies out with open throttle

Steve Fawks · May 24, 2013

I can"t figure out my problem. I"ve been through the gas tank, gas line, and carb. I"ve used heet in the gas and premium fuel without ethanol. I"ve tried rigging up a paper air filter after cleaning and checking the oil-bath filter. The intake manifold above the carb still frosts up on the outside, and the engine dies out after running at speed for less than a minute. What can mess up such a seemingly simple system?

Anonymous-0 · May 24, 2013

You are not getting gas to the carburetor. Take off the gas line and drain into a can for MORE THAN A MINUTE.

Alan K · May 24, 2013

Just to add....at times frost above the carb is normal. Ive had that on my M5 at times and on my ZA for years.

casecollectorsc · May 24, 2013

Did you open the load needle on the carb.??

Anonymous-0 · May 28, 2013

Hi Steve , donn't know if this story is relevant, but I recall back in the day when Chevy and others frosted the intake manifolds because they got plugged from carbon and had to be boiled out.

Steve Fawks · May 28, 2013

OK, at least part of the problem is fuel related. I went back to drain out the tank through the fuel line and it ran out in a steady stream until it was gone! I took off the sediment bulb, and it had a collection of debri in the bottom. I looked in the gas tank (again) with a flashlight and saw a few specks of crud in the bottom of the tank. I think the sediment crap was getting sucked up against the screen as I used more fuel and choked things off.

Don't know if I should just quit and take of the gas tank for cleaning, or try to work through it. Also, the intake boil-out sounds likely as well. Hmmmm...............

Alan K · May 28, 2013

I would screw the sediment bowl assembly out of the tank and make sure there isnt something stuck in the openings and make sure all the ports in it are open and clean. Sometimes a small piece of crud can find its way in there and is enough to slow up the flow. Sometimes a piece of something in the tank will float over the outlet and plug it as well. I remember times when we would check the fuel level with a stick...lol not thinking bark falls off into the tank. I found a couple pieces of rubber in the fuel tank of my G950 when I bought it. Think it was from the fuel filler hose.

J.Wondergem · May 29, 2013

Steve, the intake on your M5 is totally different than a Chevy. Depending on weather, the intake above your carburetor will frost up on the older Molines, which I don't see where it effects the running of it. If you like, you can wrap a piece of tin around the exhaust. do the same around the intake, and connect a tube to the two so it preheats the intake. Probably be bad in hot weather though.

M5 dies out with open throttle

Steve Fawks

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Anonymous-0

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Alan K

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casecollectorsc

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Anonymous-0

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Steve Fawks

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Alan K

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J.Wondergem

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