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-   -   Eliminating fuel pump question (https://cbrforum.com/forum/cbr-600f-15/eliminating-fuel-pump-question-156261/)

heresolong 07-06-2017 10:34 AM

Eliminating fuel pump question
 
Still struggling with this 89. Got the carbs rebuilt by Wired George and he seems to have done a very nice job, but the bike won't start at all now (keep in mind that it started and ran sort of before the carb rebuild because it had been sitting so long. Well now it's been sitting longer.) I pulled the fuel pump and did a bench test and it seems to be working but back on the bike and nothing is coming out of it when I crank so it might be the FP relay I suppose. I have a parts bike but of course I don't know if it has good parts so I will be playing with that a bit.

Actual point coming here, however. I read in another thread about CBR1000F owners just eliminating the FP and going gravity feed. Anyone know if this will work on the 600F? I'm tempted and if the bike runs at least I'll know that the problem was fuel delivery.

dennisgb 07-09-2017 03:20 PM

You can bypass the fuel pump. The problem with running like this is you lose fuel pressure when the tank gets low and you can also run out of fuel at high rpms. For troubleshooting to get it running it should work. I usually run a small plastic water bottle when starting them after carb rebuild because you can squeeze the bottle to fill the carbs. It sometimes takes a while before the carbs fill up otherwise.

chasenvolvos 10-28-2017 07:13 PM

Why would it seem ok to remove the pump. Take off the cover and file the contact. Mine were so corroded and messed up I cant believe it turned on. You can also buy them new on ebay oem. I have tested mine and it seems to work but my bike wont start either without heavy choke and then when it dies at low rpm it acts like the fuel pump isnt giving it any fuel.

heresolong 10-29-2017 10:56 AM

Quote:

Originally Posted by chasenvolvos (Post 1308727)
Why would it seem ok to remove the pump. Take off the cover and file the contact. Mine were so corroded and messed up I cant believe it turned on. You can also buy them new on ebay oem. I have tested mine and it seems to work but my bike wont start either without heavy choke and then when it dies at low rpm it acts like the fuel pump isnt giving it any fuel.

Sometimes the pumps are full of crap from years of sitting. When you run them they just dump more crap right into your freshly cleaned carbs. Ask me how I know. :icon_frown: The bikes will generally run at lower speeds with gravity feed as the tank is above the carbs. Not a long term solution but...

I just pulled the carb bank off the 88 I bought which was doing the same thing as yours. Slow jets completely clogged, which is apparently a regular thing on these bikes. I have them in the ultrasonic cleaner and am going to put it back together and see what happens later this week.

Hawkwind2016 10-29-2017 01:32 PM

Quote:

Originally Posted by heresolong (Post 1305835)
I read in another thread about CBR1000F owners just eliminating the FP and going gravity feed. Anyone know if this will work on the 600F? I'm tempted and if the bike runs at least I'll know that the problem was fuel delivery.

Just to clarify, only the '87 & '88 CBR1000F's have fuel pumps, '89 on were designed as gravity feed from the factory.

Zachy72 11-08-2017 04:22 PM

Quote:

Originally Posted by heresolong (Post 1305835)
I pulled the fuel pump and did a bench test and it seems to be working but back on the bike and nothing is coming out of it when I crank so it might be the FP relay I suppose.


Put your hand on the pump when cranking and you'll feel it click, if its working.
also it's easy to put the FP upside down so make sure your not trying to pump fuel the wrong way


Quote:

Originally Posted by heresolong (Post 1305835)
Actual point coming here, however. I read in another thread about CBR1000F owners just eliminating the FP and going gravity feed. Anyone know if this will work on the 600F? I'm tempted and if the bike runs at least I'll know that the problem was fuel delivery.


The F1 can be ridden on a gravity feed setup, but it's very janky. for testing purposes it should work just fine as long as you have over half a tank of fuel.

I went a few months with no FP and i was constantly getting airbubbles in my line or something and stalling out semi-frequently. there are plenty of options for a replacement FP though


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