| Fuel leak [message #93934] |
Thu, 29 July 2010 23:21  |
Bob Horton
Messages: 81
Registered: December 2005
Location: Brandon, Manitoba, Canada
Karma: 0
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Was planning on taking off tomorrow morning but noticed a fuel leak on the passenger side just aft of the front wheel well. It seems to be on the very outside bottom of the body but doesn't seem to be coming from above. A fairly steady small drip. Not much information in the manuals. Any suggestions???
Bob Horton
Brandon, Manitoba
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| Re: Fuel leak [message #93936 is a reply to message #93934] |
Thu, 29 July 2010 23:26  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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""Was planning on taking off tomorrow morning but noticed a fuel leak on the passenger side just aft of the front wheel well. It seems to be on the very outside bottom of the body but doesn't seem to be coming from above. A fairly steady small drip. Not much information in the manuals. Any suggestions???
Bob Horton
Brandon, Manitoba ""
That's the area of the charcoal vapor canister and the fuel line from the vapor seperator in the rear. It could be fuel venting and overpowering the canister or just a deteriorated line. I doubt it needs to screw up your trip. I would safely get under there and see if you can find the source.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Fuel leak [message #93938 is a reply to message #93937] |
Thu, 29 July 2010 23:40 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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""Thanks Bob. Could overfilling the tanks cause this?? I may have been overzealous filling the tanks a while back.
""
Absolutely, but a leak is still a leak. Given all that you can probably reduce any risk in the short term by not over filling. Many folks have discovered leaks at the vapor valve in the rear and lived with it for a while. You always have to be careful with fuel leaks so you should still probably have a look to see if it is indeed coming from that part of the system--if it is, it is probably manageable. However, if it's anything like I had on my leak in the main line to the fuel pump it could be dangerous. Leaks can travel and not ocurr where they hit the ground.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Fuel leak [message #93968 is a reply to message #93941] |
Fri, 30 July 2010 08:22 |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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On Fri, Jul 30, 2010 at 1:33 AM, Mike Miller <m000035gmc@gmail.com> wrote:
> The separator in the drivers side rear wheel-well is supposed to keep the
> liquid from coming forward to the canister(s) behind the passenger front
> wheel.
Yes, but I wonder about that, even when it is working. It seems to me that
the state change between liquid and gas for gasoline is not as obvious as it
is with water, given gasoline's much lower vapor pressure. I would think it
quite possible for fumes that get past the separate can condense into liquid
pretty easily, under the right conditions. I think the point of the charcoal
canister is to provide a place for that to happen. The vacuum on the
charcoal canister is intended to draw air through the canister into the
engine to pull those fumes in, and to dry any condensed liquid.
Many of us have removed that vacuum hose, because it provides such a
substantial vacuum leak. That requires ventilating the fuel to the outside,
which may occasionally cause some condensation of the fumes until they are
diluted by sufficient air.
I think the factory probably had it right. I will be replacing my charcoal
canister and re-establishing that connection soon. I suspect the vacuum drop
is related to a faulty canister as much as anything, but any air drawn into
the manifold from the canister ought to be reasonably fuel-rich, just as if
it was coming from the carburetor. The evaporated fumes in the tank should
be the primary source of gas for that canister.
Rick "who would put eyes on any visible fuel leak before driving the coach"
Denney
--
'73 230 "Jaws"
Northern Virginia
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| Re: Fuel leak [message #94131 is a reply to message #93934] |
Sat, 31 July 2010 19:00 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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Bob;
When I had that problem it happened with a full or almost full tank and like Hal stated the engine ran like crap till the excess fuel was out of the canister. What I did was put a 3/8" bolt in the line that went to the separator valve(located in the driver side rear wheel well) and loosened the fuel tank gas cap so the tank was vented till I was able to repair the separator valve. Some folks say the gas fumes at the cap hurt the paint inside the fuel fill housing but mine wasn't affected.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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