Found it, thanks, the simple search wasn't playing ball for me. Advanced search for it. I don't have the factory obc thing so I can't get hidden test menus, I don't seem to have any issues with my fuel gauge misreading though? Would it still be that sipon jet thing if my cluster gauge is reading right?

Hot start issue m62tub44
 

Hidden menu only uses the trip odometer button to access.

The cluster gauge can read wrong when a sensor is dirty on ether side.

Siphon jet diagnoses requires getting into the hidden menu or a scanner that can read the data directly.

On my e70 I can read fuel level with scanner I don't recall that option with my e53.

The only way to know for sure the tank is reading correctly is to run the tank down to single digits DTE and fill and see if you get 24g of fuel into the tank.

When performing this test, you can monitor test six and avoid fuel starvation with careful observation.

Still no help as my cluster has pixel issues. I have inpa if that's any good but I'm still learning how all that works.

INPA I believe can read anything OBC will tell you.

If you can drive down to E and fill the tank w ≈24g your siphon jet has not failed yet.

Ok, so run it till fuel light comes on then try put a full tank in? 109litres?! I thought they were 81l tanks?

Fuel light comes on with about 14L left. Run until actually empty on the gauge or DTE if you have enogh pixels to read the

92L I believe is e53 tank. The gauge can only read about 81-82 before the float is stuck at the top of the tank. (why the needle doesn't move for the first 80-100km).

okay cool so if the pump clicks out before it's got 80 odd litres in from the empty light then that says it's siphon jet pump issue?

Usually about 20-27L when the siphon will fail.


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Ok so I done some investigation today. The noise is coming from the Syphon jet pump side, the fuel return pipe into the sender unit is vibrating quite a bit, I pulled the sender out and the o ring is in the right position and not deformed. I didn't have a chance to do that other fix mentioned in previous posts as I've got no teflon tape. Would that make the hose vibrate? Noise is starting to get tiresome now

Inlet hose to left tank is fed by the FPR return line. Seems like pump and FPR are not "getting along" and maybe pump is not providing even pressure so the return is pulsed.

T fitting and fuel pressure gauge maybe the only way to determine what is going on