Water in fuel sensor & fuel heater in the fuel filter housing ?

[buddy]

Yes, I imagine that the corkscrew is to provide more surface area of heating, but it sounds like GM axed it themselves in later models because no one else seems to have them but 94/95 guys. Although I had one of those older style that had the drain line that came off the side of the FFM and the fitting itself has a 90 degree turn. Newer FFMs had both the drain and output fittings sticking out the same side. If its there its not really needed and is a restriction.

FTB is a good mod for anyone looking to increase performance

 

[orrum]

How can u tell if ur fuel heater is working?

 

[Bigburban]

If you go to pennisular diesel web site you can get a complete take off including the filter for a 100 bucks just click on new take off parts. Got mine there and fast shipping.

 

[Burning oil]

I can get the Wix heater. I have not actualy tried it in a FFM yet, but it sure looks the same to me, even the plug.
View attachment ffm heater.bmp

 

[Crankme69]

How can u tell if ur fuel heater is working?

My OBD1 1995 was blowing fuses so I tracked it down to the FM heater. I can also read my fuel temp on my Gmtd Scan tool.

The 1991 has a different setup I believe, can't help ya there sorry!

 

[orrum]

Thanks Crank it was worth a try. What temp does ur scan say ur fuel is when ur engine is completely warmed up?