Those of you running separate race tunes on race fuel, step inside..

[truculentSVT]

For those of you that run separate race tunes with race gas, How do you guys switch fuels? Is there a way to empty the tank, without dropping it out and emptying it? There is probably a simple way, that i've not thought about, so i'd like to hear what everyone else is doing. I'm getting ready to do a race tune, and hope I don't have to drop the tank just to switch.. T.I.A.! :beer:

 

[truculentSVT]

No one?

 

[98 Saleen Cobra]

Run it until E and fill up is how I did it lol.. I have a sumped tank now so I guess I can just pull the plug for one of the feeds in the sump and let it drain out completely..

 

[01-04Cobra]

OK, this is not the best or safest way to do it, but most people just run it low and slow until it's almost empty. Personally, if I'm on a pinch, I just unplug my feed line and turn the pumps on to empty the tank, but that's because I have a return system and I switch between E85 and 93.

What do you mean by race fuel? C16? Meth? Alcohol?

 

[Posi]

I don't drive mine but a few thousand miles a year so basically I fill up to half tank when I drive it with 93 octane. That way by the time I race it's basically down to a 1/4 tank or less usually. Then add straight race gas to half tank and race.

 

[Senkak]

I do it the red neck way.
Remove the cap and shrader valve from the passenger side fuel rail.
Take some 3/8" fuel line and put it over the valve.
Use a hose clamp and tighten it down.
Put the other end of the 3/8" fuel line in a gas can.
Start the car.
When it stalls your tank is empty.
My tuner said he can send me a tune to keep the fuel pumps running full time with just the key on. I haven't gotten around to it yet.
This works cleanly with no spillage every time.

 

[truculentSVT]

OK, this is not the best or safest way to do it, but most people just run it low and slow until it's almost empty. Personally, if I'm on a pinch, I just unplug my feed line and turn the pumps on to empty the tank, but that's because I have a return system and I switch between E85 and 93.

What do you mean by race fuel? C16? Meth? Alcohol?

I'm running a return system as well..

I'm going to be running VP 109..

 

[cbr repsol]

91 + torco to 10 gallons is 105 octane. No need to be emptying any tanks.

 

[Garrett114]

I'm running a return system as well..

I'm going to be running VP 109..

Thats what I run in both cars when the fuel light comes on I fill up with the 109 then i go ride around for a couple miles to mix it in and burn the rest of the 93 out of the lines

 

[RTCOBRA2964]

I've heard of some tuners/shops attaching a line to the fuel pressure regulator or schrader valve and power the fuel pumps which eventually empty the tank. I may find out in a few months when I get it done.