Patrol sub tank query

Not clear on just what you did, but just changing the main filler hoses over wouldn't do that.

The subtank pumps via a hose going to main tank with a one way valve in it.
this hose is in two pieces so if it was connected in wrong fuel wouldn't transfer.

My comments refer to petrol but think others are similar

You need to give us more information....
What model/engine previous and after conversion?
Is it aftermarket sub tank?
Which Light are you talking about being on? The one in the instrument cluster or on the sub tank switch?

On the GU Diesel patrols (it looks like that is what you have in your picture) the sub tank pumps fuel into the main filler hose near the filler, so if you have swapped the filler hoses you will just be pumping fuel out of and back into the sub tank and it won't transfer at all. Open the fuel caps and have a look down the hose and you should see the fuel being pumped into the filler. I think you need to put the filler hoses back to standard to get the sub tank to work first.

Did you just convert to diesel and trying to use a high flow pump causing your filling concerns in the first place by any chance??

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Hi all, I'm a bit lost as to why you would swap filler hoses in the first place, surely the difference between them is minimal anyway, I've had a GU for years and have NO IDEA why that mod would be necessary, but im sure you have a reason.

The only problem I've ever had with our sub transfer pump was the power wire from the top of the sub to the pump broke off and i fed it power from else where until we got home from Birdsville.