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a2j
08-05-2013, 08:20 AM
Yesterday was my first HPDE on a small track with lots of tight corners. I've discovered an issue with my car that I never knew existed. Like lean mixture, knock, and fuel cut off at every hard right hand corner when it gets below 3/4 of the tank. Is this normal? Some guy told me that it is a common issue with DSM. I don't have a stock fuel pump anymore.
anyonebutme
08-05-2013, 10:12 AM
common with stock fuel tank.
a2j
08-05-2013, 10:29 AM
Solution? Keep it always full or get a normal fuel tank?
a2j
08-05-2013, 12:28 PM
Fuel surge tank?
anyonebutme
08-05-2013, 01:52 PM
Many ways to solve. Fuel cell, external surge tank, internal surge tank, foam the stock tank, sump the tank, baffles, or just keep it full.
J. Fast
08-05-2013, 11:55 PM
Boat fuel tank clunk... $10 :)
J. Fast
08-06-2013, 08:10 AM
I've built a surge tank... $400 when you add the lift pump, additional fuel lines/fittings, and most importantly the fire protection and spill box for it. Welded a baffle in the stock gas tank... total bitch to drain and prep. Stuffed stock gas tank with foam..
works as long as you fuel test the foam and you add a steel baffle trap. Aftermarket gas tank... Mehh, has to be DOT and SFI approved for public road use.

^all of which work, but were costly and time consuming solutions which required added safety precautions.

We ended up using one of these in our DSM racecar for road racing. We could run the tank dry. We added a spring over the filter to keep it from getting scarred up from excessive tumbling. We tied it to a fuel line extension hose off the fuel pump pickup.

http://item.mobileweb.ebay.com/viewitem?sbk=1&nav=SEARCH&itemId=150779330101
a2j
08-06-2013, 08:51 AM
I would rather not modify my fuel tank and I'd like to keep it for as long as possible. Having a full talk all the time would be a temporary work-around solution. Car is already heavy as it is and it would be nice to run sessions with 5-10 gal instead of 20 gal. Not sure if I like foam idea. I guess the only solution I'm considering is external surge tank.
i3igpete
08-06-2013, 03:00 PM
We ended up using one of these in our DSM racecar for road racing. We could run the tank dry. We added a spring over the filter to keep it from getting scarred up from excessive tumbling. We tied it to a fuel line extension hose off the fuel pump pickup.

http://item.mobileweb.ebay.com/viewitem?sbk=1&nav=SEARCH&itemId=150779330101

now thats a cool cheap solution!