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Desmo_Demon is correct it is the red line. However, it can be very tricky to get the fuel pump assembly to seat back into the tank. Recommend vaseline - smeared liberally and be gentle and firm and no, I am not joking.

I have seen the end result of an incorrectly re-seated fuel pump and it wasn't pretty - a full tank of fuel all over a pit garage and this was a job just done by a "respected mechanic". Luckily the bike had just been taken off the trailer cold and filled up - otherwise we might have been reaching for the fire extinguishers - 15 or so litres goes a long way.

Vaseline won't react with the petrol so is safe to use :D
 

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Discussion Starter #4
Yep, vaseline is what I ended up using. Kind of helps to hold the o-ring in place, too. I tried countless times to push straight down on the pump, but inevitably, it would tip sideways. I ended up using some longer bolts with a few washers, giving each one a single turn at a time, in order to "press" it in straight. Seemed to work just fine that way, so tonight I'll dump a gallon in there and see if she leaks!
 
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