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Old 05-06-2010, 11:33 PM   #1 (permalink)
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Possible Fuel Pump Mod???

There seems to be a rash of fuel pump related issues lately...They conk out at the most inopportune times too.I was wondering why they would break down like they do so I decided to do a little research.
Anyone noticed that their pump has a Mitsubishi icon on it?I have,so I did a search on Mitsubishi fuel pumps and found out that our Kawi's aren't the only ones that run these pumps AND we're not the only ones who have problems with them.

Check this link out,pretty interesting stuff:

http://www.google.com/imgres?imgurl=...ed=0CD4Q9QEwBg

Anyone on here who's more electronically inclined care to comment?
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Old 05-07-2010, 12:24 AM   #2 (permalink)
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Don't know about the electronics, but the KHI fuel pumps I have seen are sealed units and don't have a removable end cap. One person I know who took one apart ended up with a leak and I would sooner replace the pump than burn the bike to the ground.
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Old 05-07-2010, 07:57 AM   #3 (permalink)
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Originally Posted by Hammerhead View Post
Don't know about the electronics, but the KHI fuel pumps I have seen are sealed units and don't have a removable end cap. One person I know who took one apart ended up with a leak and I would sooner replace the pump than burn the bike to the ground.
The ones on the 7's aren't sealed,I've had the cap off of both of mine.Ours look almost identical to the ones in the article,I was just hoping that someone who's a little more electrical savvy than myself could look the article over and let me know what they think.If all it takes is installing a small diode that you can get at Radio Shack into your pump to greatly increase it's reliability then I'm all about it.
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Old 05-07-2010, 08:20 AM   #4 (permalink)
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7 pumps are identical to the one in the link, the end cap only covers the relay, the pump mechanism is sealed. The diode is worth a try, I will just use some other pump if mine goes out again, there is plenty of room for a more reliable pump that doesn't cost $160.00. 2 psi is easy to get, I know NOS sells a small inline pump rated at 18 gallons per hour and 5 1/2psi for $100.00. There are tons of OE pumps that could be used as well just a matter of going to a parts store and doing some research.
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Old 05-07-2010, 08:31 AM   #5 (permalink)
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i woinder if its possible to switch to a diff pump? its simple wiring neg/pos iam not that great with electrical but a different more reliable pump might be a better choice?
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Old 05-07-2010, 09:09 AM   #6 (permalink)
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I guess anything is worth a try.. but considering you can get the same pump off a different bike for 1/10th the cost from a wrecker or fleabay .. That's the route I took... below is a list of bikes that use our pump.. but hey.. if you can make it work with the diode.. why not give it a try... nice cheap fix if you can///

Kawasaki ZX600 1995 F1:NINJA (ZX-6R) FUEL_PUMP
Kawasaki ZX600 1996 F2:NINJA (ZX-6R) FUEL_PUMP
Kawasaki ZX600 1997 F3:NINJA (ZX-6R) FUEL_PUMP
Kawasaki ZX600 1998 G1:NINJA FUEL_PUMP
Kawasaki ZX600 1999 G2:NINJA FUEL_PUMP
Kawasaki ZX750 1993 L1:NINJA-(ZX-7) FUEL_PUMP
Kawasaki ZX750 1994 L2:NINJA-(ZX-7) FUEL_PUMP
Kawasaki ZX750 1995 L3:NINJA-(ZX-7) FUEL_PUMP
Kawasaki ZX750 1993 M1:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 1994 M2:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 1996 N1:NINJA-(ZX-7RR) FUEL_PUMP
Kawasaki ZX750 1997 N2:NINJA-(ZX-7RR) FUEL_PUMP
Kawasaki ZX750 1996 P1:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 1997 P2:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 1998 P3:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 1999 P4:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 2000 P5:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 2001 P6:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 2002 P7:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX750 2003 P8:NINJA-(ZX-7R) FUEL_PUMP
Kawasaki ZX900 1994 B1:NINJA-(ZX-9R) FUEL_PUMP
Kawasaki ZX900 1995 B2:NINJA-(ZX-9R) FUEL_PUMP
Kawasaki ZX900 1996 B3:NINJA-(ZX-9R) FUEL_PUMP
Kawasaki ZX900 1997 B4:NINJA-(ZX-9R) FUEL_PUMP
Kawasaki ZX1100 1990 C1:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1991 C2:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1992 C3:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1993 C4:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1993 D1:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1994 D2:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1995 D3:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1996 D4:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1997 D5:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1998 D6:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 1999 D7:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 2000 D8:NINJA-(ZX-11) FUEL_PUMP
Kawasaki ZX1100 2001 D9:NINJA-(ZX-11) FUEL_PUMP
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Old 05-07-2010, 10:24 AM   #7 (permalink)
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Quote:
Originally Posted by ohjay View Post
I guess anything is worth a try.. but considering you can get the same pump off a different bike for 1/10th the cost from a wrecker or fleabay .. That's the route I took... below is a list of bikes that use our pump.. but hey.. if you can make it work with the diode.. why not give it a try... nice cheap fix if you can///
The way I understood from the article the diode is more of a preventative measure,it keeps the pump from burning up as quickly...In theory...So if your pump is bad I don't think that it would fix it.
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Old 05-07-2010, 10:39 AM   #8 (permalink)
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Originally Posted by AZXRider View Post
7 pumps are identical to the one in the link, the end cap only covers the relay, the pump mechanism is sealed. The diode is worth a try, I will just use some other pump if mine goes out again, there is plenty of room for a more reliable pump that doesn't cost $160.00. 2 psi is easy to get, I know NOS sells a small inline pump rated at 18 gallons per hour and 5 1/2psi for $100.00. There are tons of OE pumps that could be used as well just a matter of going to a parts store and doing some research.
I actually tried using a different pump recently to see if I could make it work but had negative results.

I used a Mr. Gasket 42S Electric Fuel Pump and a small Holley fuel pressure regulator...But...The Mr.Gasket is a steady state pump providing one constant pressure with the use of a regulator.The one that comes on our bikes is a "pulsing" style pump.
The steady pressure I was getting didn't seem to work.I would either have enough pressure at start up but not enough to run it OR too much pressure at start-up (extremely rich,black cloud and all) but then enough to run it decently.

The only thing I can come up with from this (over $100 later) is that our bikes need different fuel pressures at different times depending on how fast or hard the engine is running...Looking over the wiring diagrams for my model and year I've happened to notice that the red wire coming into my fuel pump relay gets it's power directly from the ignition coils and the black wire coming into the relay hooks right into our tachometer so I can only conclude that engine speed and rpm has something to do with how often or how much fuel the pump might try to send.

If someone else knows more about this please post up,I'd love to get a better understanding of how this all ties together.
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Old 05-07-2010, 04:05 PM   #9 (permalink)
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you can definetly upgrade pumps and its not hard...my cousin has a gsxr1000 its making something around 220-230hp but it has a walbro fuel pump on it sounds like a car pump when it goes to fire up....his bike set for longer than mine did this winter and he has no issues now been riding his all around
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Old 05-07-2010, 04:28 PM   #10 (permalink)
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Ive seen the diamond star pumps in alot of old bikes, yams, hondas etc. and they burn up pretty easy. My buddy went thru 2 or 3 pumps, turns out his petcock valve was f'd up and wasnt letting enoough fuel through.. so the pump was really straining to work.. then burnt up.

so i would also make sure your fuel lines arent kinked either. it seems they can get pinched easily against the bottom of the tank and the #1 carb vac chamber when you remove and reset the tank.
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Old 05-08-2010, 03:44 PM   #11 (permalink)
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Quote:
Originally Posted by green_rocket_of_doom View Post
you can definetly upgrade pumps and its not hard...my cousin has a gsxr1000 its making something around 220-230hp but it has a walbro fuel pump on it sounds like a car pump when it goes to fire up....his bike set for longer than mine did this winter and he has no issues now been riding his all around
It's my understanding that a lot of the newer bikes use the electric steady state pumps,especially with fuel injection since it requires such a higher psi,you'll hear the pump prime when you turn the ignition on and everything.

I def had trouble getting one to work on mine.Maybe if I wired it into the ignition circuit somewhere so that it's got a constant 12v instead of through our relay...
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