15/10/2020
Long post warning !
TL/DR : the fuel pump hose was off inside the tank... it's fixed now.
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A 1200 twin, fuel-injected : not starting after (probably) sitting a while.
Spark plugs very sooty, & were those 'cheap but fancy' all-round ground electrode type, which have a much larger gap than recommended.
Connecting a good clean plug to one side (not even in the head) let it fire up on the other cylinder (double ended coil, so a better spark that way) … which seemed to lend weight to a 'bad plugs' diagnosis.
New ones fitted today : it was exactly the same afterwards 😞
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We confirmed good compression ( a 2 minute job, so why not ? : 250+ psi ) then looked at the fuel spray from both injectors - it was a sq**rt & splash rather than atomised.
Dismantling the lines revealed pitiful fuel pressure, despite the pump shutting off as if it were primed, with no warning lamps.
Off with the tank & out with the pump & filter.
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This particular setup has a long metal outlet pipe sticking up into the tank, alongside a 'stack' of fuel pump & filter : the two connected with a short u-bend of flexible hose (10 in the 1st image - connects where the red circle is in the 2nd )… but the hose was barely connected to the outlet pipe 😁
We can't know if it had been like that from the factory in 2001, or was the result of a bungled filter change, rather later. The one-time-use clip wasn't over the pipe barb at all.
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All back together, & it started first time : a road test tomorrow will hopefully confirm that there are no other problems.🤞