Originally Posted by karrlot
I have a 91 Ward (Amtran) Volunteer with a DT466. It has a 65 gallon tank.
What do you mean by "usable"?
In cars gas gauges don't really read the amount left in the gas tank. By that I mean, there is more gas in the top 1/4 (as read on the fuel gauge) of the gas tank than in the bottom 1/4.
Is that the case with busses also?
in cars its possible to top-off the tank to the point that you submerge the float for your gas gauge... the gauge is designed to read F at usually when the gas pump shuts off.. well most people top off...
in our busses the float is near-er to the top of the tank ive found... and of course in a bus you are simply filling the tank like you would fill a gas can.. most people just fill until they see fuel right up in the shoirt filler neck.. when on most busses is close to where the float is..
on the old mechanical diesels, running out of fuel could be a really big ordeal...
you could unprime the complete fuel system... sucking your water separator, fuel filters, and the injector pump dry before the engine stalled..... it resulted in a lot of time to get back on the road as there was no lift-pump to reprime the system so you took stuff apart and poured fuel in and hand pumped, and cranked, and poured.. and in general were a completely fuel covered mess by the end.. so most of them the E was where the fuel pickup generally wouldnt accidentilly suck air on hard stops or acceleration.. quite a bit of fuel left in the tank if you were sitting still...
im not sure on the newer electronic series engines if the gauge float bottom is still well above the pickup or not.. im guessing it is ... even with a lift pump it can be tough to work air out of a diesel systrem without some manual interaction of bleeding things..