BearKiller

I know this is not very scientific; but, after the wife's truck had experienced a cold-weather no-start episode, I switched her fuel-filter.

I caught the fuel out of the old filter in a clean clear plastic jar.

Since buying the truck, we have fueled it twice; first time the gauge was near E, second time it showed 1/4 tank.

Both times, we added 8 oz. of Marvel Mystery Oil, and 12 oz. of white-jug Power-Service.

I placed this clear jar of diesel-fuel in the freezer of our refrigerator; I don't know how cold it gets in there, but it must be darn cold.

I sort of forgot about it for a couple of days.

When I examined it, there is a yellowish thick gravy substance settled in the bottom, with clear fuel on top.

I have never put fuel of known purity in the freezer, so I don't really have anything to compare to.

Is this condition normal for fuel; or, did she get some questionable fuel.

Thanks.

infidel

If anything at all the fuel may have gotten a little cloudy.
You say it was fuel you drained from the filter, that would have to be the funkiest fuel in the system, a poor experiment.
How about some from the tank or filling station instead?

BearKiller

I am gonna start running a few experiments.

When I fuel up, I am gonna squirt a little in a clean container and do my freezer test.

I am gonna test plain fuel, fuel with correct amount of P-S, with correct amount of MMO, and with my MMO/P-S mix.

After one of these experiments gets knocked over in the wife's new Maytag, I may be communicating from the dog-house.

infidel

You might want to invest in a thermometer to see what temperatures you're working with.
Straight #2 doesn't start gelling till below about 10F.
I don't think most freezers go much below zero.

DBLR

My freezer sure will go below zero, you must have yours set to a warmer temp then I keep mine at.