Sandro Seminara Posted December 28, 2007 Report Share Posted December 28, 2007 I had to replace my fuel pump today and was very simple, but here's what I don't understand... There's a bunch of exposed wiring on the fuel pump assembly, I would think you'd want all that sealed. Do those connectors sit in gas at any time? I mean I would think anything electrical exposed to gas liquid or vapor would cause an explosion. Any one know why it doesn't?RegardsSandro Link to comment Share on other sites More sharing options...
MrWinkey Posted December 29, 2007 Report Share Posted December 29, 2007 because they are on opposite sides of the pump. now that you realize this. that was my biggest issue with the flight 800 story which I still don't believe. :( Link to comment Share on other sites More sharing options...
Sandro Seminara Posted December 29, 2007 Author Report Share Posted December 29, 2007 I see a link to Saab, you know anything about exhaust systems for them. I had some questions on a 97 9000 Aero. Link to comment Share on other sites More sharing options...
Ihatespeedbumps Posted December 29, 2007 Report Share Posted December 29, 2007 The wires are submersed in gas every time you fill up the tank. I hope that they would have though through the exposed wires thing when they designed the car, I guess that's why I never put much thought into it :P Link to comment Share on other sites More sharing options...
Ozark Lee Posted December 29, 2007 Report Share Posted December 29, 2007 Any one know why it doesn't?In its liquid state gasoline is very stable. When I was a dumb jerk kid (as opposed to the dumb jerk parent that I am now) I worked at a Vickers gas station. We kept a 1 gallon pail of pump regular around to toss our cigarettes into - lit. With an open flame it would have blown up in a heartbeat but the gas always extinguished the lit cigarette.There were thousands of attempts by me and my idiot co-workers to prove the theory wrong and none of them ever worked.The wiring on the fuel pump on my Suburban actually melted the insulation completely off of the wires on its first fuel pump failure but the car didn't blow up - fortunately I had just filled the tank so it was completely submerged in the liquid gasoline and not the vapors.It all comes down to the flash point....Lee Link to comment Share on other sites More sharing options...
Serge Posted December 29, 2007 Report Share Posted December 29, 2007 Additionally, the EVAP system picks up all the vapors that would have otherwise been at the top of the tank. Link to comment Share on other sites More sharing options...
PHLY50 Posted December 29, 2007 Report Share Posted December 29, 2007 Any one know why it doesn't?For gasoline fuel, the stoichiometric air/fuel mixture is approximately 14.7 times the mass of air to fuel. Any mixture less than 14.7 to 1 is considered to be a rich mixture, so basically there is not enough air (oxygen) within the fuel tank compared with fuel vapour to make an explosive mixture.Phil. Link to comment Share on other sites More sharing options...
Ronny Posted December 29, 2007 Report Share Posted December 29, 2007 For gasoline fuel, the stoichiometric air/fuel mixture is approximately 14.7 times the mass of air to fuel. Any mixture less than 14.7 to 1 is considered to be a rich mixture, so basically there is not enough air (oxygen) within the fuel tank compared with fuel vapour to make an explosive mixture.Phil.Well, and there you go. Thank you Phil for that. For the Red Necks, what he means is;ya ain't gonna get no bang cause thar ain't no air in the gas tank.......... Link to comment Share on other sites More sharing options...
BEJinFBK Posted December 29, 2007 Report Share Posted December 29, 2007 Watch Mythbusters sometime.This was one of their topcs. Link to comment Share on other sites More sharing options...
matt1122 Posted December 29, 2007 Report Share Posted December 29, 2007 It's not just like that in cars, though, that they do this. Apparently it's that way in Jet planes as well. It needs to be like that in order to accurately measure fuel levels, etc. Here's an interesting article about using an alternate to live wires in the fuel tank: http://spectrum.ieee.org/oct05/1863 Link to comment Share on other sites More sharing options...
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