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01-23-2011, 07:04 PM
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#1
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Senior Member
Monaco Owners Club Excel Owners Club
Join Date: Nov 2006
Location: Hangin' with Sacs and the Pins
Posts: 9,412
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Fuel Tank Fittings...
Can anyone tell me what the 5 fuel tank fittings are for? (We can come up with these ideas: one feeds the generator, one feeds the engine and the third is an air vent line.)
Here is anotherangle of the 4...
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MM
*MonacoMama with the 2 Pins & SacsTC Nearby* *2007 Monaco Diplomat 40' SFT<>2006 Chevy VortecMax Toad<>2006 Buick Lucerne Leading the Way*
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01-23-2011, 07:26 PM
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#2
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Senior Member
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
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Two fuel return lines. 1 each for the engine & the genset.
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Steve Ownby
Full time since 2007
2003 Monaco Signature
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01-23-2011, 07:33 PM
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#3
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Senior Member
Join Date: Apr 2008
Location: Freeport, ME
Posts: 4,707
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I agree with Steve.
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Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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01-23-2011, 11:24 PM
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#4
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,115
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My understanding is that the diesel engines pump more fuel to the engine than the engine can use, thus the return line. As long as the engine is running in cold weather, fuel keeps getting returned to the tank and keeps the fuel in the tank from freezing.
I may be full of baloney, but that's how it was explained to me.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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01-24-2011, 05:29 AM
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#5
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Senior Member
Monaco Owners Club
Join Date: Nov 2010
Location: The Emerald Coast
Posts: 1,759
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Do you have Aqua-Hot?
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Jim and Jennie, Cats=Bittles and Potter, 2000 Dynasty 350 ISC
2013 Silverado 4x4 Towed with R1200GS in bed.
PROV23:4 Do not wear yourself out to get rich; have the wisdom to show restraint.
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01-24-2011, 06:07 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Aug 2006
Location: Ft Myers Fl / Omaha Ne
Posts: 617
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Correct answers. Fuel return lines. Almost the same as a gas engine that returns to a vapor tank, the diesel returns to the fuel tank. Good question about the Aqua-hot though. Not sure how it feeds.
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Chuck & Mary
2008 Monaco Diplomat 40 SKQ
2008 Enclave Toad
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01-24-2011, 07:36 AM
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#7
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Senior Member
Monaco Owners Club Thor Owners Club Ford Super Duty Owner
Join Date: Dec 2006
Location: Victoria, Texas
Posts: 248
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The one in the middle may be the overflow.
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Larry & Doni
2015 Four Winds 31W E-450
South Texas Renegades FMCA F376075
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01-24-2011, 07:45 AM
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#8
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Senior Member
Join Date: Apr 2008
Location: Freeport, ME
Posts: 4,707
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The EPA does not usually allow open venting/overflows directly to the atmosphere plus there has to be a roll over safety valve on the vents and overflows just in case. But there is probably a line that is used for a vent there somewhere that goes through some kind of check valve and cannister. All fuel tanks are designed so they cannot be filled to the top so there is room left for expansion and because of the location of the filler neck you cannot fill them all the way so an overflow is not required but like said a vent is required so either the heat expands the contents or air has to be let into the tank as you use the fuel.
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Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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01-26-2011, 09:44 AM
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#9
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Senior Member
Join Date: Jan 2007
Location: Everett Ontario , Mercedes,TX
Posts: 263
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gas engines have a pressure /vacuum relive on the cap to prevent "solvent"evaporation of gas in the atmosphere......diesels have an open vent ...i have cleared mine of mud dauber nests that plug it and cause vacuum in the tank when driven several times and there is no check valve in line.Not an overflow though....much too small and wrong location......just an atmospheric vent to prevent the tank from collapsing as fuel is used up
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Dennis & Sue
Fulltimers Squeezin Life
1999 Monaco Executive M-11 450 hp
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01-26-2011, 09:58 AM
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#10
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Senior Member
Join Date: Apr 2008
Location: Freeport, ME
Posts: 4,707
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On my MH I have a a contained vent system and a rollover check valve. Must be something that was added as time went by.
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Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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01-26-2011, 10:50 PM
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#11
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Senior Member
Monaco Owners Club Freightliner Owners Club
Join Date: Oct 2009
Location: Arlington, VA
Posts: 1,043
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Interesting Mike. My Dip is the same year as your rig. But my vent is just a tube hanging down.
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Robi & Dale ---- Go Navy ----
2016 Winnie TOUR 42'
Tow: '19 Buick Envision
or: '08 Buick Lucerne
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01-27-2011, 07:14 AM
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#12
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Senior Member
Join Date: Apr 2008
Location: Freeport, ME
Posts: 4,707
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Hmmmm, maybe my assumption on what I saw was incorrect. maybe I will take another look. I would think they would be the same.
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Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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01-27-2011, 08:46 AM
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#13
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Senior Member
Join Date: Jan 2007
Location: Everett Ontario , Mercedes,TX
Posts: 263
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Mike
What you have may well be an addition by the previous owner and is a very good idea.....i like it and you got my attention.As i said i have cleaned my vent out several times because mud daubers had plunged it and really didn't know that till i stopped for a fill up and heard the vacuum.luckey enough that i fill the tank at around half or it could in theory calaps the side walls in.Its a PITA to say the least as i have to remove screws that hold the panel down.(not a latch as all the other bays) remove the top of the hose and blow them out
Any way you could post a picture here?Is it near the tank itself??
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Dennis & Sue
Fulltimers Squeezin Life
1999 Monaco Executive M-11 450 hp
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