rlane5

Hi C4 Gurus' I have an 86 Vette and I want to run E85 in it, will it corrode the tank, and is the tank line. with a protective coating.. I've change the the fuel system, but did nothing with the tank
Randy

vetteLT193

I don't think there are issues with E85 and regular fuel tanks. However, it will act like a solvent and all the junk in the tank built up over the last 30++ years is going to get loosened up and end up in the filter(s). I'd think a pre-clean would help or maybe an extra filter inline until the crap gets worked out.

bjankuski

I ran my 1986 with e85 and never had any issues with the fuel system.

LiveWire1

The only time you will run into problems with E85 in your car is if you store it for the winter with a full tank. The E85 will separate over time, and that's where the tank will develop a harmful gummy coating that will have to be flushed out before it clogs the pump, filter and injectors. Store it with either an empty tank, or zero ethanol.

93 ragtop

I have been using it for about 7 years now. Upgraded the pump to a 255? and changed injectors....... No problems so far.
Randy, I will share my opinion FWIW on two things.
1. Its better to have a sealed tank, which we do, vs . a vented tank. My understanding is, the alcohol absorbs moisture, in a vented system, and that causes corrosion.
2. I have never seen any gum etc, from the fuel. In fact, I had some old E85 and tried using it to clean some old greasy parts. Not near as effective as regular gas.

383vett

My 84 had a rubber bladder inside the tank. Not sure if it's affected by alcohol. You can see the black lining below.

dizwiz24

i remember people talking about how much junk, crud was at the bottom of their c4 gas tankz

so i used a fish tank siphon and siphoned all the fuel out.

used rags to sop up any fuel left.

there was 0 debris/sediment. Not even a speck of dirt at the bottom of the tank of my 1993

To help the OP:
i run my 1993 on 100% e85 for past year. Theres been no issues. For the prior 2 years before that, i ran it on 50% e85. Again, no issues

The tank does seemed to be lined by some kind of plastic liner.

the only issue i ever had was when i spilled (and let sit) 100% methanol on my exterior paint. Despite prob 50 coats of zaino wax, it ate right thru that in the area it pooled (and i didnt wipe off).

i wrongly assumed since methanol is used in windshield wiper fluid - that id be ok. Apparently that doesnt hold true at 100% concentrations of it!

rlane5

Thanks for all the input, I'm putting a turbo on the LS and I want to run E85, because its easier than Race gas, octane boost, and Meth. My son blew up his Trackhawk the last day of the track season using 93 octane, I'm not trying to do the same.
Randy