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k^2 k^2 is offline
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Join Date: Nov 2006
Location: Livermore, CA
Posts: 36
R12S fuel pump peculiarity, at least to me

Apparently, the first time you start the bike after disconnecting the battery, the pump does not prime. I use the bike for touring only, so it sits for weeks w/o running. Between trips I installed another fused SAE connector for the battery tender. Leaving tomorrow on the next trip, so I wanted to top off the gas. Turned the key: no whirring, followed by the click. Went over to my other R12S, turned the key and it primed, as usual. I then went back to the first (non-priming) bike and it fired up immediately, but still not priming first. Got gas, returned home, turned the bike off, then turned the key back on: it primed.

I have disconnected the batteries on the bikes many times, but never actually noticed this before. You learn something new every day. Cheers. - K^2
Kevin Knauss
'13 HP4
'10 S1000RR (track only)
'07 R1200S
Old 05-30-2018, 03:42 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
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smddanny's Avatar
Join Date: Jun 2008
Location: Branford, CT.
Posts: 313
Think these read the pressure in the sys and run the pump when necessary.. so if there is no backstreaming of fuel thru the check valve in the pump.. then they don't whirr....
2007 R1200S, 99 R1100S, 2008 K1200S, 2009 Moto Guzzi Griso, 2014 Stelvio, 1975 Kawasaki H1, 1970 Honda CT-90
Old 05-31-2018, 08:13 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)

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