sub fuel tanks

Submitted: Thursday, Apr 14, 2005 at 16:37
ThreadID: 22063 Views:1414 Replies:5 FollowUps:0
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HI everyone
I have just recently purchased a patrol 4500 as the main fuel gauge goes down the sub tank one does too without pushing the sub tank button on the dash is this normal.
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Reply By: flappa - Thursday, Apr 14, 2005 at 16:46

Thursday, Apr 14, 2005 at 16:46
No. Completely independant.

You could actually run out of fuel , even with the Sub tank full.

There is no automatic fuel transfer (other then the small amount at startup). You need to do it.

If the sub tank gauge is moving with the main tank.

Either , gauge is stuffed , or , the pump is running full time , and constantly dumping fuel into the main tank
AnswerID: 106746

Reply By: Member - Stillthinkinaboutit - Thursday, Apr 14, 2005 at 17:11

Thursday, Apr 14, 2005 at 17:11
As Flappa mentioned, there is a small amount of fuel transferred each time you start the vehicle ( assuming the main tank is not full ). If you do a lot of short trips the sub tank will empty fairly quickly.
AnswerID: 106750

Reply By: Alan S (NSW) - Thursday, Apr 14, 2005 at 17:15

Thursday, Apr 14, 2005 at 17:15
A mate of mine drives a patrol and told me that if he just drives short trips around town that the sub tank can be more than half empty by the time the main tank fully drains. He reckons a 1/2 litre or so must get dumped from the sub tant to the main tank every time you start the motor.
AnswerID: 106751

Reply By: howie - Thursday, Apr 14, 2005 at 19:52

Thursday, Apr 14, 2005 at 19:52
every time you start the car a small amount of fuel is pumped from sub to main, i think it was something to do with condensation?
so yes, plenty of sharts = sub goes down
AnswerID: 106770

Reply By: Member -Peter (York 4x4) - Thursday, Apr 14, 2005 at 22:07

Thursday, Apr 14, 2005 at 22:07
Hi , if you take the fuel cap off the main tank and have someone start the car you should be able to see the small pipe that sends fuel from the sub to the main just inside the pipe and see fuel pumping through,this can be seen on most GUs , this is done to prime the transfer pump , it is a good idea to keep some fuel in the sub for this reason .
AnswerID: 106804

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