Hi,I joined this forum about two years ago when a friend gave me a 1988 K 100 .It is a nice bike with only 12000 miles on it but hasn't run in over 12 years.I got sidetracked with other projects but the other day I found my way back to the K.I fixed the brakes so now it has brakes.Then I got a new battery.The fuel pump is shot,I knew this would be the case.So,now I have the tank off and I cleaned out all the rusty debris from the rotting fuel gauge sender. Here are a few photos of the bike and the inside of the tank befor & after I cleaned it.I have a new ( good used)sender coming .I need to find out what material to make a gasket with for it.Also going to get the pump kit from euroelectrics .I need new fuel lines and then I'm going to look at the injectors.This is all new to me,I work on vintage mostly ,you know ,carbs and points stuff but I've been wrenching for 50 years so I'm not clueless.Any advice would be greatly appreciated.

That's a nice clean tank you have now. Check the alloy just under the pump for corrosion, they often go there.
The sender has a large O-ring for a seal and providing the surface is good and clean then the O-ring is all that is needed. Heaps cheaper to buy the fuel pump bits for the later model K1100, it does the job properly and it's easier to get a replacement pump on the road if you need it. Or buy the rubber vibration damper for a 38mm pump and get a pump on fleabay for as little as $20

Welcome back to the forum.

Glad you're getting back to the K.

Welcome to the forum.  Nice job on the tank.  Should be a pretty nice ride when you get it done.

Welcome 

Lots of advice, help, humor and old fashioned camaraderie to be found here on the K forum

Cheers

gary

don't cheapskate the fuel hose inside the tank .....else it will perish dramatically

the current recommendation for hose inside the tank ( with all this ethanol stuff floating about far more frequently these days ) is 30r10  meaning it is rated for internal use and least loss of vapours which are more prevalent with the new mix of additive enhanced fuels .

as you go up the number on the last bit of the specification r7 ...r8... r9 etc .... the porousness of the hose becomes less ...or the integrity increases

meaning if you chose 30 r7 for the external fuel pressure lines ...which is quite ok for efi uses ....you will notice that that hose carries a strong smell of fuel ... but is not rated for internal use ...as the outer wall of the hose is very  erm economical
also you will notice the internal webbing of the hose (which makes it less susceptible to distortion - expansion from pressure _ ) becomes more effective as the r rating increases.

hint whilst in the rebuilding phase ...  just leave the hoses from the tank to the fuel rail about an inch or so longer than what you removed ...this will aid in moving the tank off its mounts without disconnecting the hose ..or the lower fairings to get access ... ( a pain always ) just to access the radiator filler cap and all around there ?


just something that might help longer term ..

welcome back


have fun

Thanks for all your replies and encouragement.I'm into it now and it's starting to move along.Today I took apart the fuel injectors  , shot some carb cleaner thru them until it ran out the other end clear and am soaking them in injector cleaner overnight . I numbered them so they will go back where they came from.The info on the types of fuel line is very valuable to me,thank you.I do want to run all new lines inside and out. I think once I get the fuel system in shape this bike will be a runner.Everything else looks real good.I'll do an oil change and new coolant before I put it all back together and try to get it started.I have a good feeling about this bike and I can't wait to get out on the open road on my first trip on her.That will be up to my camp in the Adirondacks ,about 400 miles away.The plan is to sell that place,move to the desert in north west Arizona and use this bike as my rider out west and wander.At 67 years old that's all I want to do now and this bike should serve me well.

I should serve you well indeed. It would pay to put new O-rings, pintle caps and filters in the injectors. It only cost at most $20 and well worth it.

RicK G wrote:I should serve you well indeed. It would pay to put new O-rings, pintle caps and filters in the injectors. It only cost at most $20 and well worth it.

I'm thinking of just using these as are for a couple tanks of gas and then upgrading to those 4jet kind.I see them rebuilt here and there for about a hundred bucks.

I know a few use the 4 hole injector but my theory is that the ones sold on ebay as an upgrade (oem#0280150415) are actually a downgrade. They are designed to run at higher pressures and at 36psi a K100 will run just a tad lean. 
1 hole Vs 4 hole injectors