? On changing gas

Randall Klein · 07-19-2017, 06:23 PM

Switching VP octanes, how long for new octane to pass fuel check
Ran and dry, and then filled with fresh & new

Thanks for any opinions

Ed Wright · 07-19-2017, 07:55 PM

I have pumped my fuel cell dry, and refilled with the new stuff. I have a fuel line for that. I pump the old fuel into a jug, pour in the new fuel, pump a quart or so of that to flush the lines. Has always passed just fine after that.

Rsmith38 · 07-19-2017, 08:15 PM

If you have foam in the fuel cell you need toremove it. It holds enough of the old fuel to fail you. Had it happen to me.

Ed Wright · 07-19-2017, 08:31 PM

I have no foam in mine for that reason. I should've mentioned that. Sorry.

J DeForrest · 07-19-2017, 10:41 PM

Randall,

I have changed from C-11 to 12, now on 14 with the same foam in the cell with no issues. I drained the tank and lines completely, and then emptied about a 1/4 gallon from up front to try to get it all out. Now, I did run at a local combo race with the new fuel each time I changed, so the car had a chance to clear itself out before I ran at a divisional or national where I was checked.

Jason

Randall Klein · 07-19-2017, 11:04 PM

Thanks, that's what I was hoping to hear, as I did not take foam out. Planning on T & T Wed to clear it out....we'll see. Going from 11 to 12

nhramnl · 07-20-2017, 08:31 AM

Hey Randall & Jason - If you're willing to share the information, why did you (or are you going to) move away from C-11? I think your LS combination might benefit, Jason, but Randall, your 265 should like C-11 better than C-12, based upon conventional wisdom. Whadda you guys know that the rest of us don't?

Ed Wright · 07-20-2017, 12:03 PM

I would expect his 265" to prefer C11. My LT1 does, and it has more compression. Mine likes to be just a tick richer on C11. Like 12.9/13.0 vs 13.2~.

Randall Klein · 07-31-2017, 08:12 PM

Just an update, passed fuel check in Topeka, pumped C-11 out, did not do anything to the foam, put C-12 in
Acquired a 498CI 1969 Camaro which needs C-12, so I just bought 1 barrel, no tricks, just cheap

Anybody see anything with C-25? Just curious

07-19-2017, 06:23 PM	#1
Randall Klein Senior Member Join Date: Dec 2002 Location: Lincoln, Nebraska Posts: 785 Likes: 45 Liked 316 Times in 67 Posts	? On changing gas Switching VP octanes, how long for new octane to pass fuel check Ran and dry, and then filled with fresh & new Thanks for any opinions

07-19-2017, 07:55 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: ? On changing gas I have pumped my fuel cell dry, and refilled with the new stuff. I have a fuel line for that. I pump the old fuel into a jug, pour in the new fuel, pump a quart or so of that to flush the lines. Has always passed just fine after that. __________________ Ed Wright 4156 SS/JA

07-19-2017, 08:15 PM	#3
Rsmith38 Member Join Date: Mar 2011 Posts: 186 Likes: 0 Liked 28 Times in 15 Posts	Re: ? On changing gas If you have foam in the fuel cell you need toremove it. It holds enough of the old fuel to fail you. Had it happen to me.

07-19-2017, 08:31 PM	#4
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: ? On changing gas I have no foam in mine for that reason. I should've mentioned that. Sorry. __________________ Ed Wright 4156 SS/JA

07-19-2017, 10:41 PM	#5
J DeForrest Member Join Date: Aug 2007 Location: Ramsey, MN Posts: 112 Likes: 95 Liked 73 Times in 18 Posts	Re: ? On changing gas Randall, I have changed from C-11 to 12, now on 14 with the same foam in the cell with no issues. I drained the tank and lines completely, and then emptied about a 1/4 gallon from up front to try to get it all out. Now, I did run at a local combo race with the new fuel each time I changed, so the car had a chance to clear itself out before I ran at a divisional or national where I was checked. Jason __________________ superstock5150@gmail.com

07-19-2017, 11:04 PM	#6
Randall Klein Senior Member Join Date: Dec 2002 Location: Lincoln, Nebraska Posts: 785 Likes: 45 Liked 316 Times in 67 Posts	Re: ? On changing gas Thanks, that's what I was hoping to hear, as I did not take foam out. Planning on T & T Wed to clear it out....we'll see. Going from 11 to 12

07-20-2017, 08:31 AM	#7
nhramnl Senior Member Join Date: Feb 2010 Posts: 507 Likes: 8 Liked 358 Times in 83 Posts	Re: ? On changing gas Hey Randall & Jason - If you're willing to share the information, why did you (or are you going to) move away from C-11? I think your LS combination might benefit, Jason, but Randall, your 265 should like C-11 better than C-12, based upon conventional wisdom. Whadda you guys know that the rest of us don't?

07-20-2017, 12:03 PM	#8
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: ? On changing gas I would expect his 265" to prefer C11. My LT1 does, and it has more compression. Mine likes to be just a tick richer on C11. Like 12.9/13.0 vs 13.2~. __________________ Ed Wright 4156 SS/JA

07-31-2017, 08:12 PM	#9
Randall Klein Senior Member Join Date: Dec 2002 Location: Lincoln, Nebraska Posts: 785 Likes: 45 Liked 316 Times in 67 Posts	Re: ? On changing gas Just an update, passed fuel check in Topeka, pumped C-11 out, did not do anything to the foam, put C-12 in Acquired a 498CI 1969 Camaro which needs C-12, so I just bought 1 barrel, no tricks, just cheap Anybody see anything with C-25? Just curious