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Fuel pump tests now selector

 
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bonanza(at)vodamail.co.za
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PostPosted: Sat Mar 17, 2007 10:59 pm    Post subject: Fuel pump tests now selector Reply with quote

Listers,
On a fuel injected, 250 hp low wing with three tanks, which would be the recommended selector valve to avoid this problem?

Thanx
Bob Verwey

From: owner-engines-list-server(at)matronics.com [mailto:owner-engines-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com
Sent: 16 Mar 2007 11:05 PM
To: engines-list(at)matronics.com
Subject: Re: Fuel pump tests


Jess makes a good redrive unit and lives where is is" hot" in the summer, in fact it is in the 90's down there now. YUCK. Jess,I am assuming you are running mogas in your V-6 Chevy.If so have you ever had a vapor lock condition in the extreme heat of Las Vegas? I made a test of mogas on my beast last year and it hiccuped at 13,000 and 45f degrees. That got my attention but I safely made it back on the ground.I am not sure the fuel was the problem though because I made some other changes at the same time trying to get the oil cooler to shed more heat and probably elevated the under cowl temp too much which heated up the fuel lines going to the carb. Plane goes up to 17,999 msl perfectly on 100LL. I would like to hear stories from people on past experiences of runnig mogasand vapor lock issues.
thanks in advance.
do not archive
Ben Haas
N801BH
www.haaspowerair.com

-- BELTEDAIR(at)aol.com wrote:
Dear List:
I have just gotten in on the tail end of this problem, but we have been working with people to come to a solution. We found the fuel selector valve on low wing planes to be leaking air around the shaft but not leaking fuel. IF it were a high wing with a lot of head pressure fuel would seep out. But on low wing planes fuel does not seep out but air in. We built a manometer to prove the theory. We changed the .06 cent "O"ring around the shaft then put a drop of engine oil to make sure it did not pull in. We experienced engine roughness at high power settings returning to normal at lower power settings. If the aux fuel pump were turned on, it made the condition worse. In early 2006 we went back 5 years in the NTSB files and found 99 instances where the engine quit then would run when it was removed from the wreckage. Fuel injected engines are worse due to the high suction. It equates to putting a hole in a straw and trying to drink. This was found on the "Imperial" type valve. This valve was and is used in most GA and experimetal craft.
Jess

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