Gulf Stream Owners RV Forum - View Single Post

mfa · 04-24-2008, 12:05 PM

Overhead in the driver's seat there should be a sticker with the build codes of installed equipment when it left GM. Here are the fuel tank codes --
N23 - 40 Gallons
NG6 - 40 Gallons
NH4 - 40 Gallons
NH5 - 60 Gallons
NJ9 - 80 Gallons
NN4 - 60 Gallons

Or you can crawl under there and read it off the side of the tank.

My 2006 Ultra C5500 has an 80-gallon tank, but you have to be very patient to get 80 gallons into it. First fuel cutoff is about 60 gallons, then you can trickle in another 20 gallons. I think the tank vent system is poor.

Also, the fuel gage is not very accurate on mine. If I have a full tank, the fuel gage will not drop off the full position until I've driven 150 miles or more -- at least 20 gallons down.

I get about 7.5 mpg at 65 mph in flat country. Towing a 2002 Honda Civic, I get about 6.5 to 7.0 mpg. I can figure on driving 400 miles or so on a (really full) tank with about 20 gallons to spare.

04-24-2008, 12:05 PM	#3
mfa Senior Member Join Date: Sep 2006 Posts: 305	Overhead in the driver's seat there should be a sticker with the build codes of installed equipment when it left GM. Here are the fuel tank codes -- N23 - 40 Gallons NG6 - 40 Gallons NH4 - 40 Gallons NH5 - 60 Gallons NJ9 - 80 Gallons NN4 - 60 Gallons Or you can crawl under there and read it off the side of the tank. My 2006 Ultra C5500 has an 80-gallon tank, but you have to be very patient to get 80 gallons into it. First fuel cutoff is about 60 gallons, then you can trickle in another 20 gallons. I think the tank vent system is poor. Also, the fuel gage is not very accurate on mine. If I have a full tank, the fuel gage will not drop off the full position until I've driven 150 miles or more -- at least 20 gallons down. I get about 7.5 mpg at 65 mph in flat country. Towing a 2002 Honda Civic, I get about 6.5 to 7.0 mpg. I can figure on driving 400 miles or so on a (really full) tank with about 20 gallons to spare.