Haynes Forums  

Go Back   Haynes Forums > Haynes Roadster Forums > Engine/transmission
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 6th December 2010, 10:05 AM
chriseyj chriseyj is offline
Senior Member
 
Join Date: Feb 2009
Location: Derbyshire
Posts: 121
Default zx9r pump

I tried to start my zx9r engine for the first time on the weekend but the pump doesn't seem to want to suck up fuel. The pump is the proper zx9r one and I have it mounted in the engine bay.
It is clicking as it should and I have tried hard wiring it to bypasss the relay. The manual says it will suck up from a container without being gravity fed but I tried gravity feeding it also and it did move a little fuel but it didnt seem to be pressurising the float bowls. Even tried pumping some white spirit and it did move a little but only when I gravity fed it, odd.
Could the carbs not be letting fuel in and be airlocked?
I know you can get the opposite problem where the floats are stuck open from old sticky petrol and it pumps out the vent when you prime them.
Think it might be the pump?
Swapped the pipes on the pump around just incase and it blew weak bubbles in my petrol can! so have the inlet the right way.
Heard you can clean the contacts on the back of the pump not sure if this is to do with the cut out though or the contacts that make it occilate in the first place therefor it wouldnt be clicking.
Any Ideas? Thanks chris
__________________
My Build Pics
http://www.flickr.com/photos/43580487@N06/
Reply With Quote
  #2  
Old 6th December 2010, 10:21 AM
davidimurray's Avatar
davidimurray davidimurray is offline
Senior Member
 
Join Date: Jan 2009
Location: Near Cardiff
Posts: 742
Default

I tested the fuel system on my car a couple of weeks ago. I'm using a ZX6R pump and carbs (on a pinto). I connected a length of hose and a funnel to the filter and filled this with petrol. Then connected the outlet on the pump to my fuel pipe, then a rubber section to my carbs. Filled the funnel with petrol and turned the key (which is directly linked to the fuel pump relay). The pump then started clicking rapidly for about 10-15 seconds before it sucked in a big slug of petrol. Once there was enought petrol in the system the pump stops clicking. I didn't do anything to 'bleed' the floats. What have you got between the 'tank' and the pump - could soemthing be stopping fuel getting to the pump?
Reply With Quote
  #3  
Old 6th December 2010, 12:05 PM
chriseyj chriseyj is offline
Senior Member
 
Join Date: Feb 2009
Location: Derbyshire
Posts: 121
Default

I did think the fuel filter could be blocked but I tried without it at one point and it still didn't suck up any petrol or stop pumping(clicking) when it got to pressure or met any resistance like its supposed to. You would think a blockage would cause a pressure build up and cause the pump to cut out?
Anyway this morning while I waited for my car to get warm enough for the doors to open, and the hand brake to defrost (I'm learning Alfas dont like the cold) I tried draining the floats on the carbs and discovered fuel in them?
I think a little had got in them from gravity and a little effort from the pump still not convinced its working properly though.

Still wouldn't start then I thought -5 degrees maybe it needs choke, put a cable tie around the choke mechanism and hey presto it started for the first time! Oil light went out and it ticked over, reved up for some reason at one point which was a bit scary it makes a propper motorbike noise.

DIY manifold leaks at the collector though was a bit tight to get welder in.
__________________
My Build Pics
http://www.flickr.com/photos/43580487@N06/
Reply With Quote
  #4  
Old 6th December 2010, 12:31 PM
chriseyj chriseyj is offline
Senior Member
 
Join Date: Feb 2009
Location: Derbyshire
Posts: 121
Default

Don't think I mentioned but I have the pump mounted in the engine bay as I have read other people have mounted them there with success.
Might relocate it under the tank for I read it gives the pump an easier time of it, and they generally prefer pushing to pulling the fuel.
__________________
My Build Pics
http://www.flickr.com/photos/43580487@N06/
Reply With Quote
  #5  
Old 6th December 2010, 01:01 PM
snapper snapper is offline
Senior Member
 
Join Date: May 2007
Location: Chelmsford, Essex
Posts: 360
Default

The pump on a bike is either in the tank or below, so self primes using gravity,
Try lowering the pump, best of all mount it low near the tank, it will push better than pull.
Another solution is a facet lift pump to swirl pot then bike pump to carbs
Reply With Quote
  #6  
Old 6th December 2010, 01:21 PM
chriseyj chriseyj is offline
Senior Member
 
Join Date: Feb 2009
Location: Derbyshire
Posts: 121
Default

Thanks I think I'll mount it under the tank at the back like you say that way there should always be a gravity feed to the pump and it should give it an easier life.
I have also ordered a replacement pump though because even gravity fed it didnt seem to build up to pressure or stop pumping as the manual says and I could see fuel in the filter and it being agitated slightly so it was trying to do something.

Have read that with a facet pump you will need a pressure regulator so to not over pressurise the carbs. As the pump will run all the time and not on demand as the bike one does.

Cheers chris
__________________
My Build Pics
http://www.flickr.com/photos/43580487@N06/
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 03:07 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.