Hi everyone, i have a 1985 D100 sl/6 pickup-truck, it has the original single barrel carb.
My problem is with a sticking float inside the carburator, every time i stop at the lights, when already warm it starts running rough and sometimes it stalls.
I had this problem before, and i tracked it to a sticking float, so i tried to un-stick it by moving the revs and some hard stop&go and it worked.
It has been sitting for a couple of months after that and last week i took it out...same problem except this time it won't go away.
I don't feel like taking it apart unless i have to so my question is:
Is there any kind od solvent/chemical that i can pour into the tank and could free-up the float?

Are you sure the float itself is stuck? It's possible that the needle and seat need replacement.
One more thought, is the float made of brass or is it that black "stryrofoam"(I know it's not really styrofoam- I just can't think of what it's called ) Sometimes that black material gets saturated with fuel and it just wont float-it sinks instead.

The "black styrofoam" is called Nitrophyll, and it can indeed get saturated with fuel. This makes it too heavy and it will not work properly.

When was the last time this carb had a good, thorough going-through including a new float? I agree that the needle and seat are prime suspects. Hot weather's coming, it may be time to do the pump-to-carb fuel line mod I posted about quite a while ago! I'll dig it up and repost if it's not still around.

Thanx for the reply's, i actually haven't opened the carb yet, i assume that it hasn't been re-built since 1985, so i will take a look inside, see what is going on.

If you have a brass float it may have a little pin hole leak in it. I had had them develop these pin hole leaks on the bottom of the float and when the engine and weather were cool the air in the float would contract and suck fuel in. Unfortunately if there was enough fuel in the float the fuel would not get pushed out even after the engine warmed up. This made the float heavy and not work right. The best thing is to rebuild the carb and replace the float.

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Former bent 6 owner
Mark