RDS auxiliary tank

austingta wrote:

dennych1 wrote:
I am looking to install a 60 gallon RDS gravity tank in back of my 2015 chevy 3500HD dually. Looking for some answers before purchasing.

1) can you fill your main tank as you drive
2) will it stop filling when main tank full automatically
3) does truck have a problem when fuel gauge always reads full until RDS tank is empty.
4) Do I add a fuel filter and water seperator(any suggestions.)

Thanks for the help
DEnnis

My results are a little different.

My 12VDC normally closed isolation valve seems to have malfunctioned and now it lets diesel flow into the main tank until it's overfull without power to it or the small fuel pump I have installed. I can see diesel in the filler neck. Nothing actually overflows or leaks out, so that's a plus.

However, my chech engine light is on and my fuel gauge and all DTE calculations are at LOW and low fuel lights are on.

It is clearly caused by this overfill situation. I have now turned off the manual ball valve at the tank and will report back after I burn some fuel. Hopefully, it will reset itself.

Anyone else have problems after staying full too long?

After driving around 30 miles with the shutoff valve closed, the system reset itself and all is normal now. As was reported in the 2010 thread on another forum I referenced, some of these trucks can't be left to fill all the way to the brim without some consequences. I need to find a solenoid valve that stays tightly closed when not powered. The problem is the diaphragm needs some pressure on it to close. I'll keep looking.

No harm done.