edwardlcy Posted January 3, 2012 Share Posted January 3, 2012 hello guys, there's a snag happening on my aircraft involving the fuel vent system that i'd appreciate ur input. currently my aircraft has fuel continuously dripping out from the outboard vent line even though the aircraft is inside the hangar on a cool night...after turning on the boost pump, the dripping stops...but if carry out fuel transfer on ground into #1 tank the dripping starts again...when refueling from the SPR into #1 tank fuel gushes out of the outboard vent line as well... we already defuel and purged the #1 tank twice, first to replace the inboard and outboard vent valve, second to replace the check valve near the collector vent tank...the problem still persists. any idea on how to trouble shoot and further investigate? appreciate and thanks in advance! Quote Link to comment Share on other sites More sharing options...
bischoffm Posted January 5, 2012 Share Posted January 5, 2012 Lose or cracked connections in the vent line. Vent box could also be cracked. We had similar issue, the vent line had a bad wiggins bead and seal. Repaired that and the leak stopped (the tank was serviced to only 6600lbs at the time of venting). Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted January 6, 2012 Share Posted January 6, 2012 Lose or cracked connections in the vent line. Vent box could also be cracked. Agree!! With the Boost pump off any fuel flow into the tank will cause air to exhaust through the vent and the crack is allowing your vent tank to refill. The air pushes out the fuel that has collected in the vent pipes and/or tank. Check each fitting not just for tightness but also make sure each one has the seal installed. Also check the pipes and tank for a crack. Good luck! I HATE(D) going into tanks The OUTBOARD most of all!! Quote Link to comment Share on other sites More sharing options...
vans Posted February 25, 2012 Share Posted February 25, 2012 would the crossfeed valve possible thing to replace? since we been through the same thing~ all of part related to the vent thing was replace and inspect and there nothing miscellaneous~ im just guessing there could be the feeding line~ Quote Link to comment Share on other sites More sharing options...
vans Posted February 25, 2012 Share Posted February 25, 2012 would the crossfeed valve possible thing to replace? since we been through the same thing~ all of part related to the vent thing was replace and inspect and there nothing miscellaneous~ im just guessing there could be the feeding line~ Quote Link to comment Share on other sites More sharing options...
doc130 Posted June 4, 2012 Share Posted June 4, 2012 replace the check valve in the surgebox.I also agree on checking seals in the wiggins fittings. Quote Link to comment Share on other sites More sharing options...
ARosica Posted July 28, 2012 Share Posted July 28, 2012 The outboard main tanks have a cork gasket on the Aux vent valve. It's located under the inboard top wing panel. It's the first thing I change if I have this problem and it usually fixes it. Quote Link to comment Share on other sites More sharing options...
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