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Re: Is it a fuel vapor issue??
[Re: noplanb]
#1059392
08/22/11 02:50 PM
08/22/11 02:50 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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high rpm it'd b less likely to vapor lock as the most fuel is being consumed in that state so it's moving fast & least likely to stagnate & absorb heat. I'm thinking starvation, I'd get a vac gauge w a psi side (most have it) & tape it to your windshield & run a neoprene line to a T at the CARB INLET & see what you have for pressure at the offending rpm EDIT that's 4000+ rpm at speed not in your driveway
Last edited by RapidRobert; 08/22/11 02:53 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Is it a fuel vapor issue??
[Re: PJ68RT]
#1059400
08/25/11 10:22 AM
08/25/11 10:22 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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sock clean/lines clear/diff pump, iirc you checked tank venting. I wonder if it is vapor locking. Not running E10 correct? Lines not close to any exhaust? dont know if this could b easily done but just brainstormin, could you bundle up/pack the mech pump w dry ice for a quick run?
live every 24 hour block of time like it's your last day on earth
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Re: Is it a fuel vapor issue??
[Re: PJ68RT]
#1059402
08/25/11 10:35 AM
08/25/11 10:35 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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It's the E10. confirm not by mixing some race gas w it but run it completely empty then use the race gas. Plus the E10's vapor pressure is going to b worse w your higher altitude.
live every 24 hour block of time like it's your last day on earth
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Re: Is it a fuel vapor issue??
[Re: RapidRobert]
#1059405
08/26/11 10:10 AM
08/26/11 10:10 AM
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Joined: Jun 2008
Posts: 102 Colo
PJ68RT
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Well i put the straight race gas in and it ran good. When it was good and hot fuel pressure would drop to 2-3psi during WOT run, but it would keep pulling and A/F ratio stayed constant. So i guess i must have been boiling the gasahol just enough to cause starvation at high RPM but not enough to cause a total vapor lock situation. Wonderful stuff that E-10 is Now, i need to see how much race gas i need to mix with the gasahol and still have it run good. I wish i could get non-ethanol premium close to home...
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Re: Is it a fuel vapor issue??
[Re: PJ68RT]
#1059406
08/26/11 10:29 AM
08/26/11 10:29 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Sorry you had to go thru all the checkout of the fuel system for naught. I should a known from your descrip of it being "temp dependant" that it was vapor locking but didn't think it'd b at high rpm as it's typically a heat soak issue but I didn't know about the E10. We're spoiled a bit here w both pumps avail since it's intro 25+ yrs ago
live every 24 hour block of time like it's your last day on earth
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