Modern Motorsports Ltd Posted August 15, 2001 Share Posted August 15, 2001 Forgot about this one....coming home from Mt. Baker I stopped at a friends place and as can happen the hood gets popped , another friend with a wicked 442 was their and wanted to check out the Chevsun. We both 'just' spotted a drop of fuel crest out of my vent line and run down it! What's up with that? I opened my gas cap and it had vaccuum, I'd filled up about 50 miles previous if that and it was a hot day but the driving should have kept pressures OK (ie. no excess expansion? unless exhaust or something heats it up??). I've had no carbon cannistor since it was converted to the V8 and vent line is just bent up in my engine bay so it's end is just above or enar valve cover height with tape on it's end and a pinhole in that tape. Can slosh in any way get up the vent line (it was a lot of agressive lower speed driving, or excess turbulence in EFI tank with my newer high volume pump shooting out the narrower return line into the tank?)? When I did the EFI install I flushed the fuel line and the return line but 99% sure I never touched my vent line....this was the only time I've seen it do that but I"m v. leary as it's not so far from headers etc if driving/engine bay air movement....a buds car (Charles Sterling) had a engine bay fire the other week involving a fuel line so I don't want to ignore it... Thanks...... Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted August 15, 2001 Share Posted August 15, 2001 I'm not sure how to answer your question but I can tell you what I've done. Vent from the fuel cell right over to a hole in the fender to vent. I'm NOT comfortable with it but I'm not sure what else I can do. For a little while, and I mean only a few days, I had the vent shut with a cap. The darned cell now "oil cans" from the expansion it did! There wasn't even any gas in it when this occured... I've got a roll over valve for it but it seems you have to DRILL an additional hole to fit it - it won't screw into th event. I've also got a one way valve I thought I'd use on th event until I realized that it won't really do anything more than what I've got now (hard to explain). IMO, if the pickup for that "vent" is at anytime below fuel level it CAN put gas up the pipe. NOT cool, I would at least vent it someplace where there's no exhaust to be found... Quote Link to comment Share on other sites More sharing options...
Modern Motorsports Ltd Posted August 15, 2001 Author Share Posted August 15, 2001 quote: Originally posted by BLKMGK: IMO, if the pickup for that "vent" is at anytime below fuel level it CAN put gas up the pipe. NOT cool, I would at least vent it someplace where there's no exhaust to be found... I think it's clearer to me now......gas tank was completely filled up and then the fun continued so unfortunately it likely sloshed in/not too happy about it either way.......should be purged now so it doesn't laquer up that line I"d guess.... Quote Link to comment Share on other sites More sharing options...
Kevin Shasteen Posted August 15, 2001 Share Posted August 15, 2001 Ross, My International 4x4 P/Up has an extra smaller "accessory" tank (not sure what else to call it) located in the upper driver's fender just for such a reason...if the truck is ever taken off road & the vent's find themselves below fuel lever...the excess fuel will spill over to that tank & fill that tank which then feeds back to the carb. Pretty cool, or so I thought, for International to think about that. I know my tank is for 4x4'ing; but it's kind of the same principle in action as the balance (surge) tank. Something to think about none-the-less. I wouldnt leave it to chance...all it takes is the right set of circumstances & one drop of fuel on the exhaust to ignite I've had a car, 70 Cutlass Supreme, go up in smoke due to a leaking fuel line. Its not fun to watch...the car had a spotless 25 year old interior at the time! Kevin, (Yea,Still an Inliner) Quote Link to comment Share on other sites More sharing options...
Modern Motorsports Ltd Posted August 15, 2001 Author Share Posted August 15, 2001 quote: Originally posted by Kevin Shasteen: Ross, I wouldnt leave it to chance...all it takes is the right set of circumstances & one drop of fuel on the exhaust to ignite I'll figure something out, just a safe exit for it perhaps. One drop igniting doesn't concern me at all as their is nothing else flammable to get going/ie. no supply to feed it along. Although it's just best to now play with fire as you've said Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted August 15, 2001 Share Posted August 15, 2001 Umm, one drop is all it takes! Remember what's at the end of that line? Yup, a whole tank of gas and don' think for a second that th evapor that comes out of that pipe isn't flammable as all heck either. That one drop ignites, the vapor burns, oh boy mission conrol we've got a problem! I too have been there, done that, and watched my first car burn. Gas is nothing to fool with, pick a different exit, vent it to the catch can in the passenger rear, do something. For that matter, I'm now considering venting my tank to the little tank Datsun put in the back passenger side and then venting THAT tank like I am now. It would at least keep liquid gas from spilling anywhere I'd think... Trans first... Quote Link to comment Share on other sites More sharing options...
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