Question about 1989 BMW K 100 LT

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My 1987 K100 LT Fuel hoses.

I need to relace the left hand fuel hose (as you face them from near side). The right hand hose is simple but cant see where the left one goes. All fairings are off.

Which is flow and which is return?

How do I replace the left one.



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It isn't the most straightforward without diagams. The system is under pressure as it is EFI, so firstly you need to depressurise it. This involves removing the battery before doing anything else. In order to replace the pipe, you need to remove the whole tank, this procedure takes up 2 and a half pages of the Clymer manual - I would recomend you either purchase the manual or get it into a BMW service centre.

Posted on Jul 03, 2009


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How do I change the fuel valve on 2003 road king

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How to reprime your diesel truck after a fuel filter change

If you just about kill your battery or starter after you change your fuel filter trying to get it started again so much so that you put off changing it when you should Here is a much simpler way and should only cost you about 30 bucks and an hours time and can be done with simple hand tools

first obtain a small low pressure fuel pump that operates off 12volt
then your gonna need a foot or two of fuel hose and some clamps
your also gonna need two hose barbs that screw into the fuel pump

now locate the fuel lift pump on your engine most models it's low on the front left side(note: if your model has a internal fuel pump located inside of the fuel tank stop right here you don't need to do this ) locate the steel line comming from lift pump to the filter/heater unit
using a tube cutter cut this line in a place thats accessable to your fingers and not on a curve or bend cut a piece of fuel line thats long enough to connect the fuel pump into the gap you have made use the hose barbs on the pump side and just clamps on the steel line side (Note : deburr edges of steel line before sliding hose over them using a small file) affix the hose clamps on all connections to keep them from comming off

the wire's comming from the new fuel pump should be long enough to reach the trucks battery terminals (observe polarity) if not extend them with a few scrap's of wire

now your ready to change the filter
unsrew the old filter carefull to not spill too much fuel over the exh manfolds
using a dab of fresh fuel lube the o-ring seal on new filter and spin it on tighten about a half turn after the o-ring contacts the housing
now using a bike tire valve tool (shrader) loosten the vent valve on filter unit (middle brass valve) and connect the wire's of your new pump to the battery (do not start truck yet) wait untill all the air bubbles are out of the vent valve and slowly tighten the vent valve again using bike tire tool (electric pump is still running ) now disconnect the wires to new fuel pump
and tuck them out of the way (the new pump stay's in place untill next use)

start truck as normally and idle for a few minutes

your done and your battery's not near dead and your starter is not boiling hot simple.

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