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Which of these pipes lets the tank run empty? Pics included, can anyone identify the hose?

233 Views 8 Replies 5 Participants Last post by  Tinsnips
Hey all, thanks in advance for the help. Got a '99 750 here, been sitting for 2 years. (premium fuel in it though thankfully).

I wanna get the old fuel and whatever other junk is in there drained out before I fill her up and start her again.

Which one of these hoses do I detach to let the tank run empty? Does anyone know?
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The hose in the first picture is the fuel pump connection, however, I don't think it flows fuel when disconnected as I recall.

The hoses in the second picture just look like the vent and scupper drain hoses.

Honestly, it would be easier to just siphon out what you can then fill with fresh fuel.
Cheers, but I was hoping to let all the muck and dirt that's undoubtedly at the bottom of the tank after so long flow out with it. Who knew it was so hard to let a fuel tank drain out.

What if the ignition is switched on after disconnect? Would a working fuel pump drain the fuel out?
Your '98 'may' be different than my 2018 but one should be a tank vent, one tank overflow, and the circled one the supply line to the fuel rail. To empty my tank I just disconnect the supply line from the fuel rail, put the end of the line into an empty 5-gallon gas can, and jump the fuel pump relay terminals to pump the gas into the gas can. Note: it's possible that any debris in the tank could clog the fuel filter, so just taking the tank off and dumping it from the filler cap may be a better option.

Thanks a lot for your advice, I really appreciate it. Mine's a 99, the first year with fuel injection.

I'd take the tank off but that looks confusing as well.

The yellow bolts I can't seem to wedge a crescent wrench behind to undo the bolts.
The purple centre bolt I can't seem to take out as it hits the frame
The red bolts seem to have some further attachments deeper into the sides of the frame

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As for the hoses behind the tank there are actually 3 of them. Vent, overflow and a third one I have no idea what it does:

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