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  #1  
Old 6th December 2010, 10:05 AM
chriseyj chriseyj is offline
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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
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Old 6th December 2010, 10:21 AM
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davidimurray davidimurray is offline
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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?
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Old 6th December 2010, 12:05 PM
chriseyj chriseyj is offline
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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.
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Old 6th December 2010, 12:31 PM
chriseyj chriseyj is offline
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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.
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Old 6th December 2010, 01:01 PM
snapper snapper is offline
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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
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Old 6th December 2010, 01:21 PM
chriseyj chriseyj is offline
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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
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Old 6th December 2010, 09:24 PM
wylliezx9r wylliezx9r is offline
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I'm also using a zx9r install, doesen't seem to matter where i have the pump positioned doing test runs it seems to deliver plenty of fuel. I would suspect you have a dodgy pump mate. I believe you can use the pump from any four cylinder carb fed bike engine of around the same capacity, they're all mitsibushi i believe.

Cheers Dan
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Old 20th January 2011, 12:43 AM
mistergrumpy mistergrumpy is offline
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I think I had this when I did mine. Check the earths are right ( I connected a jump lead engine block to chassis ) and have you put the resistor in place where the starter switch should be? Can't remember where it should be off hand but it's well documented.
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  #9  
Old 20th January 2011, 12:19 PM
chriseyj chriseyj is offline
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It turned out to be a bad pump, bought another one and it pumps great. I wonder if these pumps have a diaphram in them that breaks down or something. The old one didnt seem to have much suction unlike the new one.
The resistor is a good tip for anyone with a zx9r, I just got a 1/2 watt one from maplins it seems to work fine.

Cheers Chris
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