At what point has the oil gone bad?

[jim hardy]

I have an older ford pickup with a 6 cylinder inline engine and single barrel carter carburetor. Put E10 ethanol in it and you will be putting an accelerator pump in the carb.

I have a '68...
Any recent carb overhaul kit should have alcohol resistant parts.

In 1986 i got a letter from Johnson Outboards telling me alcohol would soon be coming to motor fuel inmy area with no public warning, so i should take my almost-year-old two stroke outboard to the dealer for installation of new fuel pump internals.

It attacked some tubes in the fuel system and wrecked thousands of outboards that had VRO automatic oil injection.
To anybody with such an engine - i recommend mix your tank 100::1, that way if you lose injection you can safely idle home.

 

[Averagesupernova]

I would bet I have bought between 6 to 8 accelerator pump diaphragms between this pickup and one a year newer that is my dads. These parts are probably very old stock since there is little demand for them. The carb kits didn't come with the diaphragm. That was extra. I know E85 kits are sold but they are usually for higher end performance carbs. Not a lot of demand for that sort of thing on a single barrel carb.

 

[jim hardy]

The carb kits didn't come with the diaphragm. That was extra.

thanks for the heads up !