Fuel tank breather hose sucking in water

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Fuel tank breather hose sucking in water

Unread post by Stevos4b » November 22nd, 2013, 3:24 pm

Today's Sun ask Smithy there was an article about water vapor getting into fuel tank through the breather hose while driving on wet roads is this possibly .i've had water in my injector pump once before ,guessing it came from bad fuel.
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Peter Aawen
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Joined: June 17th, 2005, 8:01 pm

Re: Fuel tank breather hose sucking in water

Unread post by Peter Aawen » November 22nd, 2013, 3:48 pm

It can be from water in bad fuel, it could be from water vapour getting sucked in on wet roads as Smithy suggests, OR it could even be from condensation forming in a partly filled tank over time as the temperature changes overnight etc and the fuel tank itself gets colder than the air inside it (good reason for avoiding leaving tanks empty or partially empty for too long). Then again, if you ever drive thru water that is at any time deeper than the filler cap (don't forget the bow wave you make when you drive thru, the splash up the sides of the vehicle, and any splashing that may occur underneath the vehicle when the wave of the water level hits the front of the tank below the moving car - so go gently at less than a brisk walking pace to avoid all those) it could well be water (or mud) getting sucked straight in thru the breather - and all it takes is that little paper element breather/one way valve to get soaked once & it's pretty much useless; so from there on in, it can be neat water/mud getting delivered directly into your fuel tank!! :(

Which is a just a whole bunch more reasons for adding your fuel tank breather to the breathers that you raise & fit proper water resistant filters to (not cheap paper element type in line fuel filters!!) AND why you shouldn't ever blast thru water making 'speccy for the pictures' spray - all that's doing is adding to the potential damage to your car, as well as probably blasting water &/or mud/other crap past the seals into your bearings in hubs, gearbox, diff pinion, axles etc!!

It certainly does happen, and it does sometimes kill fuel pumps, driveline components, &/or engines.
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