BrandonH

Kept forgetting to post this, got the verdict a month ago. My 993 cup developed a bad miss last time out. Verdict was that the cell foam had begun to degrade/dissolve into a crumbly mess, seizing up the fuel pumps. The shop's theory (Dawes) was that someone had used pump gas regularly in it's history.
Apparently earlier cell foam was not alcohol resistant.

Thought I'd pass it on since many running stock classes are likely using pump gas at least from time to time.

Another reason to hate ethanol. I've already had to rebuild mechanical fuel pumps and some fuel lines in some vintage cars. Now this.

Glen

You should plan on reconditioning fuel cells at a minimum every 5 years, sometimes every 3. Although ethanol may accelerate the degradation it occurs even just using race fuel over time.

analogmike

this winter I pumped out all the fuel from my 73 to keep the cell dry

but not sure if that's good for he carbs, never had carbs on a racecar before.

Any suggestions or not to worry??

CCA

The GA team I worked with briefly had a lot of trouble with ethanol. It destroyed the foam, the fuel bladders and softened fuel lines. I think that was the first year Sunoco was using it in their race fuels, and lots of folks were having trouble. Didn't take long at all for stuff to get ruined. I hate the stuff.

J richard

If you run on pump gas you may run into this at some point, here in the SW we get stuck with up to 10% every winter due to EPA sillyness...i made the mistake of fueling up one winter and letting the car sit till spring, not good on parts...if you run in areas where its a problem you can run the methanol resistant foam (for drag cars/boats) little more pricey but will eliminate the potential problem.

Veloce Raptor

Even Owl Bore....er....Al Gore...had finally admitted that corn-based ethanol in gasoline is a moronic idea impelemented solely to suck up to the powerful corn farm lobby. But like most retarded things implemented by monolithic oxygen-thieving bureaucracies, it will take an incredible effort to undo it.








Professional Racing and Driving Coach

Plavan

My experience back from 2002-

http://forums.pelicanparts.com/porsc...know-long.html

Glen

Great tip, Thanks!
G

chris walrod

E10 or E15 wont present much of a problem until it sits for some period of time where the Ethanol will separate from the gasoline and sink to the bottom. And it will begin to rot the bottom of the cell.

The DP cars had this problem at first but now must pump out when not in use.

We've found the FT-5 spec fuel cell material is the most durable. FT-3 and FT-3.5 not so much.