I have a 40' 2003 Travel Supreme with a Spartan Mountain Master chassis, Cummins ISL 400. On a recent trip I left the fuel cap at the service station. I am having a difficult time finding a replacement. I went to NAPA then a local RV dealer - he said call Spartan, Spartan said to call Cummins, Cummins said to call Camping World, Camping World told me to call Cummins.......and so on.Any suggestions on where a cap can be had? Would greatly appreciate some help with this.

Start here and if you have a dual fill tank, it should be easy to call and get an answer if you have the second fill cap. If not, give them a call and they can tell you how to figure out the thread count. http://www.fueltankaccessories.com/#!fuel-caps/c15f6

Not the same vehicle, but I wanted a locking cap for my Ram with the Cummins diesel and went to O'Reilly auto parts. The clerk said that they either had one or they could get one for me. Luckily for me, they had what I needed in stock. Maybe they can help you out.

I am guessing it is most likely a cap used for over-the-road diesel trucks. Might want to check a truck parts dealer.Ray

Did the same thing with my coach. I went to a auto parts store that had a large assortment of fuel caps and found one that fit. I believe it was a NAPA store.

I also had the same problem. Go to NAPA or other parts store and ask for a cap that will fit a 2002 GMC Durmax diesel, they have both locking and regular about $20 for the locking kind.

Diesel Fuel Cap | Good Sam Community

14 Replies

Westenthal
Explorer
Aug 06, 2013
Did the same thing with my coach. I went to a auto parts store that had a large assortment of fuel caps and found one that fit. I believe it was a NAPA store.
Raymon
Explorer
Aug 06, 2013
I am guessing it is most likely a cap used for over-the-road diesel trucks. Might want to check a truck parts dealer.

Ray
robsouth
Explorer II
Aug 06, 2013
Not the same vehicle, but I wanted a locking cap for my Ram with the Cummins diesel and went to O'Reilly auto parts. The clerk said that they either had one or they could get one for me. Luckily for me, they had what I needed in stock. Maybe they can help you out.
barlow46
Explorer
Aug 06, 2013
Start here and if you have a dual fill tank, it should be easy to call and get an answer if you have the second fill cap. If not, give them a call and they can tell you how to figure out the thread count. http://www.fueltankaccessories.com/#!fuel-caps/c15f6

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Diesel Fuel Cap

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