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fuel hose blew up Mon Sep 03, 2012 12:39 pm
VPutin
active member
Hi everyone from Russian K-bike owner (BMW K100RS'90)
Just another topic of "bike doesn't start", but with little intro.
While ago, on crossroad my bike, suddenly, decide to stalled. When I try to accelerate, to prevent it, my fuel hose blew up and poured my knees by gas. I replace hose on a road with wheel compressor one and reach home, with some riding troubles - engine won’t work on low RPM, and strange sound of fuel pump work.
So, I decide to replace fuel pump. Put a new one (BOSCH) from one Russian car with same parameters like original one (doesn't have code around me, but it pretty same as NAPA ones)
When assemble it back, bike do not want to start.
It's possible to start with open throttle, but it run up no more than 2000, and stop when I lose the throttle.
I check the fuel pressure - in a beginning pump raise it up 30-40 psi, then run quickly down, when starter works it easily reach 60-70 psi, but going down to zero quickly. So, it confirms my idea of dead FPR.
Check sparkplug – they reasonable black and sooty. But when I clean one and check, it seems to be ok.
As I can imagine big fuel pressure can make my injectors leaky, so it easiest way to replace them with new one.
So, my next steps are replacing FPR, injectors and sparkplug, but may be I missed something and should look somewhere else?
Any ideas are highly welcome )
Just another topic of "bike doesn't start", but with little intro.
While ago, on crossroad my bike, suddenly, decide to stalled. When I try to accelerate, to prevent it, my fuel hose blew up and poured my knees by gas. I replace hose on a road with wheel compressor one and reach home, with some riding troubles - engine won’t work on low RPM, and strange sound of fuel pump work.
So, I decide to replace fuel pump. Put a new one (BOSCH) from one Russian car with same parameters like original one (doesn't have code around me, but it pretty same as NAPA ones)
When assemble it back, bike do not want to start.
It's possible to start with open throttle, but it run up no more than 2000, and stop when I lose the throttle.
I check the fuel pressure - in a beginning pump raise it up 30-40 psi, then run quickly down, when starter works it easily reach 60-70 psi, but going down to zero quickly. So, it confirms my idea of dead FPR.
Check sparkplug – they reasonable black and sooty. But when I clean one and check, it seems to be ok.
As I can imagine big fuel pressure can make my injectors leaky, so it easiest way to replace them with new one.
So, my next steps are replacing FPR, injectors and sparkplug, but may be I missed something and should look somewhere else?
Any ideas are highly welcome )
Last edited by VPutin on Tue Sep 04, 2012 3:14 am; edited 2 times in total
1986 k75, 1985 K100rt, 
-o: 
