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07-06-2009, 09:01 PM
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#1
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Senior Member
Join Date: Mar 2008
Posts: 222
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Leaky fuel caps
Every time I fuel up, until I get below 1/2 tank, Fuel will leak out of both caps and run down the side of the coach. I clean up the sides, but next time I stop, same mess. Do I have to only fill to 1/2 tank, or it there a better answer? Are the caps vented? Would it case a problem if I sealed the caps better? 
__________________
2008 Dutch Star 4354
Full Slide, Bath & 1/2
2008 Jeep 4 Dr Unlimited tow
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07-06-2009, 10:55 PM
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#2
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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Have you checked the fuel vent line, vent tube to cap location and if its hot don't over fill tanks, heat will expand fuel and maybe out your fuel caps.
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07-07-2009, 06:20 AM
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#3
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Senior Member
Join Date: Jul 2007
Location: Labelle,FL Riverbend MC Resort
Posts: 148
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I can tell you what the problem is,Newmar put vented caps on many motorhomes even though the fuel tank has a vent hose.My 05' dutch star had the leaky caps till i replaced them with non vented caps.Better yet get a set of non vented locking caps at napa to protect your investment in your tank.!! 
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2007 EXDP 4104 ISM-500 41' NKK 17453 L FMCA 387671
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07-07-2009, 07:34 AM
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#4
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Senior Member
Newmar Owners Club
Join Date: Sep 2006
Location: Edgewater, NJ-Now touring the USA
Posts: 955
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Had the same problem until I replaced the caps. Did the same as Bigblock, replaced with locking non-venting. Stopped the problem right away.
NAPA Part #703-2614
Slant Part #21591
I used the NAPA caps with matching locks
__________________
2005 KSDP 3910-----2007 Jeep Liberty
THE MIND IS LIKE A PARACHUTE, IT MUST BE OPEN TO WORK 
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07-08-2009, 09:42 AM
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#5
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Senior Member
Newmar Owners Club
Join Date: Apr 2007
Location: Panama City, FL
Posts: 166
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I replaced my caps with the NAPA locking non-vented caps. I still have leaking after a fill up at least to the first stop which is probably my own fault for filling right up to the top.
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Wayne H. & Nixie Miller
2006 Newmar Dutch Star 4027
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07-08-2009, 08:29 PM
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#6
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Senior Member
Newmar Owners Club
Join Date: Aug 2007
Location: Belfair WA.
Posts: 777
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Had the same problem, found I had to put caps on really tight, when I did that no leakage. The one click and go strategy doesn't work, need one click passed good an tight!
Spike
__________________
"Those who stand for nothing fall for anything"
2020 Dutch Star - 3736 - L9 450HP, Freightliner
2008 Newmar VTDP - 3330 - ISBXT 350 Spartan NVS
FMCA F113720, NKK 18573
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07-23-2009, 02:45 PM
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#7
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Senior Member
Newmar Owners Club Mid Atlantic Campers
Join Date: Mar 2009
Posts: 125
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had the same problem on 2008 ksdp
Called Spartan or Newmar, can't remember which.
They authorized my dealer to "re-bend" the fuel fill lines.
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2008 KSDP 3910
Central PA part-timers 1 son and a Sheepdog
Buick Enclave/Blue Ox/SMI Air Force One
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07-25-2009, 07:07 AM
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#8
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Junior Member
Join Date: Mar 2009
Posts: 11
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Had the same problem.Newmar put nonvented caps on, After I left the factory in about 2 hours it sounded like a tire blow out. the vent line must have been blocked and the tank oil canned, no damage but it sure made a large bang. They said to go to Spartan and have them pull the tank and fix the vent. Figured after they finished I'd only have more problems. Left the vented caps on place a rag around the cap and change it when it gets oil soaked.
2005 DutchStar
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07-31-2009, 10:55 AM
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#9
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Senior Member
Newmar Owners Club
Join Date: Apr 2007
Location: Panama City, FL
Posts: 166
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After a fill-up I always stopped after the cap clicked a couple of times thinking that was as tight as it gets. After my last fill-up I followed Spikes advise and clicked it 360 degrees around, no leaks this time.
Thanks Spike!
__________________
Wayne H. & Nixie Miller
2006 Newmar Dutch Star 4027
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08-01-2009, 06:41 PM
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#10
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Senior Member
Join Date: Mar 2008
Posts: 222
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Quote:
Originally Posted by Harm
After a fill-up I always stopped after the cap clicked a couple of times thinking that was as tight as it gets. After my last fill-up I followed Spikes advise and clicked it 360 degrees around, no leaks this time.
Thanks Spike!
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Harm,, I just back from a 300 mile run, and before I left I did exactly what you stated, and It also took care my problem too. VACMAN
__________________
2008 Dutch Star 4354
Full Slide, Bath & 1/2
2008 Jeep 4 Dr Unlimited tow
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