Tank Goop!

Wanna talk BMW K bikes? Here's your home.
Post Reply
User avatar
Gibson
Posts: 219
Joined: Tue Apr 19, 2016 11:45 am

Tank Goop!

Post by Gibson »

Well you were right Wobbly, I removed the fuel pump last night(started as a filter change). Lots of black goop underneath the pump and in the screen. Could this be the remains of the impeller!? All the rubber lines are mushy goop. It looks like I should be able to bench test the pump to see if it works. Any words of wisdom here?
User avatar
jagarra
Posts: 896
Joined: Mon Dec 26, 2011 12:42 pm
Location: Reno, Nevada

Re: Tank Goop!

Post by jagarra »

On the in tank fuel pumps sometimes there is a pad that the pump sits on to absorb vibration. These can dissolve over time and create your chocolate mess.
1974 R90/6 built 9/73
1987 BMW K75S
1994 BMW R1100RS
1964 T100SR Triumph
1986 Honda XL600R
User avatar
Gibson
Posts: 219
Joined: Tue Apr 19, 2016 11:45 am

Re: Tank Goop!

Post by Gibson »

Thanks, I will bench test the pump tonight. If the pump is bad, I guess I will have to buy the kit from euromotoelectric. They said the new parts in the kit are better for use with gasohol.
User avatar
jagarra
Posts: 896
Joined: Mon Dec 26, 2011 12:42 pm
Location: Reno, Nevada

Re: Tank Goop!

Post by jagarra »

I looked in the parts fiche, there is a vibration damper, but it is on the top of the pump, the only thing on the bottom is a filter. That vibration damper is pretty pricey.
1974 R90/6 built 9/73
1987 BMW K75S
1994 BMW R1100RS
1964 T100SR Triumph
1986 Honda XL600R
User avatar
Steve in Golden
Posts: 3088
Joined: Tue Aug 03, 2010 4:30 pm
Location: Golden, CO USA

Re: Tank Goop!

Post by Steve in Golden »

jagarra wrote: Thu Mar 29, 2018 2:45 pm I looked in the parts fiche, there is a vibration damper, but it is on the top of the pump, the only thing on the bottom is a filter. That vibration damper is pretty pricey.
BMW="Bring More Wallet"
User avatar
Gibson
Posts: 219
Joined: Tue Apr 19, 2016 11:45 am

Re: Tank Goop!

Post by Gibson »

I got the whole kit from Euromotoelectric for 199. I was told that the new parts are better in E10 fuel.
Wobbly
Posts: 300
Joined: Mon Aug 07, 2017 8:48 pm

Re: Tank Goop!

Post by Wobbly »

Yep, you're going to need to start with all new fuel lines, because your bike pre-dates E10. You can use the common, black, J30 automotive fuel line from the LAPS for the external lines, but if you have fuel lines internal to the tank those are made with even more specialized hose rated for ethanol inside and outside.
After 20 years as a professional bike mechanic and 30 years as an engineer I know just enough to be dangerous !
User avatar
Gibson
Posts: 219
Joined: Tue Apr 19, 2016 11:45 am

Re: Tank Goop!

Post by Gibson »

After having the injectors cleaned, bike runs amazing! It cost me about 275 for the complete pump kit and injector cleaning.
Wobbly
Posts: 300
Joined: Mon Aug 07, 2017 8:48 pm

Re: Tank Goop!

Post by Wobbly »

Good to hear ! Congrats.
After 20 years as a professional bike mechanic and 30 years as an engineer I know just enough to be dangerous !
Post Reply