Fuel tanks GU Patrol

Paul!! i think it is actually to just run the sub tank pump each time you start the vehicle.. Motor companies dont think ahead that far.. regards Michael

Thanks for the feedback.I reckon that the sub tank has dropped by half when the main has droped by three quarters.this is the first 4wd I have owned, so all new to me.

Have a good chrissy. my 3 kids are all bouncing off the walls in anticipation for the fat man to arrive.He is a good bloke as he droped the GU TD off to me last week !.
cheers
Giffo

Eric, It is true that the pump works for a short time every time you start the motor. If you doubt this, try opening the fuel filler door and remove the main tank's cap. Standing outside the vehicle, start it up and move to the filler's hole......you will witness the fuel being pumped into the neck of the main tank, as it happens right up near the top of the neck.

Also, my advice to all Patrol owners is to keep the main tank full (or close to full) all the time. This will ensure the pump has some fuel to "work" on all the time. These pumps are very expensive and if you leave the sub tank empty the pump will stuff up in a short period of time.
Also, keeping both your tanks full as much as possible will avoid (or lessen) the liklihood of algae forming in either of the tanks.

Cheers

Roachie

Roachie.
Thanks for that. By far the main transfer is by the sloshing action, Vehicles have been doing this long before computers were invented. I used to make and fit long range tanks and have my customers come back with the same question all the time, Nissan hopefully have corrected this error because as you say it will destroy the pump on a dry tank.The function is not necessary because the fuel moves through the pump anyway. Eric

Eric I can not see for the life of me how a Nissan sub tank will be affected by sloshing action, as the sub tank is lower than the main in my truck is only connected by the pump hose & it feeds to the filler of the main & all return lines go to the main, even if the main is over filled it doe's not back flow into the sub

Vincent.
Do you agree that fuel does transfer on a trip without you switching on the pump. if so you have the proof . Just to demonstrate this you could unplug your pump and note the level in the sub tank still drops. Happy motoring. Eric.

Eric, have a look at page 1-29 of the Nissan owners manual, it states, " Each time the engine is started, fuel is automatically transferred from the sub tank to the main tank for a few seconds".

Exactly right 100% and it is no urban myth. As they say "When all else fails R T F M" which stands for: " Read the manual".