BenK wrote:
Smaller fuel tank on the GMT800/GMT900's
Actually the 8.1 burbs have a 26 gallon main tank, and a smaller 12 gal tank that sits above the spare tire, so 38 gals total fuel capacity. Both tanks have their own in-tank electric pumps, fuel sending units, and fuel/return/evap line sets. The fuel filler neck goes into the smaller rear tank, and there is also a 2" filler hose that allows fuel to flow from the higher rear tank into the lower front tank.
When running the front main pump is primary, and the PCM turns the rear pump on/off according to some mysterious algorithm. The PCM averages readings from both fuel senders to come up with a general level to display on the dash gauge.
I became quite informed about all this when I replaced the rusted fuel lines with stainless this spring. A complex set up for sure.
The fuel filter is easily accessible on the inside of the frame rail under the drivers door, but is right in front of the ABS unit so a little cramped to get to.
And good point on the hitch receiver too, should be replaced.
