Gas gauge ??

[tagcat]

We have a 2004 Monaco Diplomat. Before we took off on this trip we had a R/V dealer check things out ,we asked them to check the gas gauge because a little movement by 1/4 tank.They said the sending unit on tank was fine no problems.We just figured unit was on slope,etc.
Took off on this trip and the gauge will never show full moves from 1/4 to 3/4 all over the map.We just now write the mileage and when we have gone 450 miles we fill it up.This is a hassle .Has any one had this problem before?How did you solve it? I just do not know were to start! Ground,sending unit,etc.
Thanks for any advice.

[JFXG]

Originally Posted by tagcat

.....the gauge will never show full moves from 1/4 to 3/4 all over the map.We just now write the mileage and when we have gone 450 miles we fill it up.This is a hassle .Has any one had this problem before?.........

Who knows what goes on in a 10 year old fuel tank? Some kind of gunk or alien growth on the moving parts ? RVs typically have pretty cheap gauge systems. Mine waves around somewhat also. I'm not sure if there's a fix worth pursuing.

QUESTIONS: do you know the quantity of your tank? Have you calculated your mpg ?

This is not a hassle, this is just real life in large vehicles. Almost everyone I know who has a motorhome has a fluky gauge. An accurate and reliable fuel quantity indicating system will cost at least a couple of thousand dollars, not work well for very long, and achieve very little. Everyone I talk to has figured their mpg, knows how far they can go, and keeps track of the odometer, because you*don't*trust*fuel*gauges.

I have a 150 gal tank, get 7.4 mpg. I can go over a thousand miles to dry tank. At about 750 my low fuel light will come on, and at about the same point I lose my generator fuel feed. I know all these things because I've watched them happen, (well, not the dry tank part ;-) ) but even if my gauge were perfect I'd still want to know these things, because you *don't*trust*fuel*gauges. Because I know these things, I am usually at the fuel pump somewhere between 500 and 600 miles.

You've now had the opportunity to get a head start on this vital knowledge! Your Monaco has a 100 gal tank, so around 500 is a good place to start thinking about a fuel stop.