---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 08/12/18: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:59 PM - Fuel fumes in the cockpit (Jon Blake) 2. 01:55 PM - Re: Fuel fumes in the cockpit (Frank Stelwagon) 3. 02:02 PM - Re: Fuel fumes in the cockpit (PS) 4. 07:28 PM - Air Systems (woodja51) 5. 07:30 PM - Re: Fuel fumes in the cockpit (Walter Lannon) ________________________________ Message 1 _____________________________________ Time: 12:59:53 PM PST US From: Jon Blake Subject: Yak-List: Fuel fumes in the cockpit Im getting fuel fumes in the cockpit in my stock CJ with stock motor. I dont smell anything during ground operations or when full throttle ops on take off. When I get to about 4000 feet and open the throttle all the way I start smelling gas. When I back off to less than full throttle or about 3/4 throttle the smell seems to go away. Opening and closing the canopy doesnt seem to have much effect on the fumes. The fumes arent overwhelming... but they do persist and seem to be associated with full throttle. I removed the cowling; washed the engine and then had someone pressurize the fuel system using the wobble pump while I inspected the engine compartment looking for leaks... nothing. There was a slight hint of fuel vapors around the bottom of the carb but nothing too strong and certainly no dripping. Im open to any suggestions and even guesses at this point. JB Sent from my iPad ________________________________ Message 2 _____________________________________ Time: 01:55:06 PM PST US From: Frank Stelwagon Subject: Re: Yak-List: Fuel fumes in the cockpit Pull the belly panels and carefully examine the fuel sump tank for leaks. Water will migrate to the sump and cause corrosion. Frank Sent from my iPhone > On Aug 12, 2018, at 12:59 PM, Jon Blake wrote: > > ________________________________ Message 3 _____________________________________ Time: 02:02:04 PM PST US Subject: Yak-List: Re: Fuel fumes in the cockpit From: "PS" You may also want to pull the wing root covers and see if the line from the tank to the fuselage is seeping. Phil -------- Phil Read this topic online here: http://forums.matronics.com/viewtopic.php?p=482334#482334 ________________________________ Message 4 _____________________________________ Time: 07:28:43 PM PST US Subject: Yak-List: Air Systems From: "woodja51" Hi all , doing a masters project on composite air tanks etc as replacements for steel OEM . Anyone got any good info on any research already done ? Im also after some pics I saw a while ago of what happens when someone put oxygen rather than air /N2 in a Yak I think. PM me or email mwuillemin@mac.com thanks ! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=482337#482337 ________________________________ Message 5 _____________________________________ Time: 07:30:33 PM PST US From: "Walter Lannon" Subject: Re: Yak-List: Fuel fumes in the cockpit Jon; Sounds like possibility of a vent system problem. Check the wing joint connections as Phil has suggested and check for blockage of the inlet. The highest point of the system is right beside your left shoulder. A corrosion pin hole here could be the source. Walt -----Original Message----- From: Jon Blake Sent: Sunday, August 12, 2018 12:59 PM Subject: Yak-List: Fuel fumes in the cockpit Im getting fuel fumes in the cockpit in my stock CJ with stock motor. I dont smell anything during ground operations or when full throttle ops on take off. When I get to about 4000 feet and open the throttle all the way I start smelling gas. When I back off to less than full throttle or about 3/4 throttle the smell seems to go away. Opening and closing the canopy doesnt seem to have much effect on the fumes. The fumes arent overwhelming... but they do persist and seem to be associated with full throttle. I removed the cowling; washed the engine and then had someone pressurize the fuel system using the wobble pump while I inspected the engine compartment looking for leaks... nothing. There was a slight hint of fuel vapors around the bottom of the carb but nothing too strong and certainly no dripping. Im open to any suggestions and even guesses at this point. JB Sent from my iPad --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.