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Old 05-27-2009, 07:13 PM   #1
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GSXR 750 fuel pump trouble

I know you're out there...

Help me Obiwan, you're my only hope.

'04 GSXR 750 starting problem:
When it hasn't been started in a day or so, the fuel pump runs, but the bike won't start. It cranks but doesn't even sound like it is trying to start.
I got frustrated and hit the gas tank and the sound of the pump changed. (got lower in pitch)
I tried the starter and, bingo, it started right up. Runs great after it starts and it will restart all day long. Next day, it's back to crank, beat gas tank, crank, beat gas tank, until the pitch changes and then it starts.
It sounds like the pump is cavitating, until I whack on it, then it begins to work right.

Could this be a sticking check valve and is it repairable?
If not a check valve then what else might it be?

Any help will be greatly appreciated since this has been going on for several months and is getting worse.
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Old 05-28-2009, 07:28 AM   #2
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Quote:
Originally Posted by bumblebee View Post
I know you're out there...

Help me Obiwan, you're my only hope.

'04 GSXR 750 starting problem:
When it hasn't been started in a day or so, the fuel pump runs, but the bike won't start. It cranks but doesn't even sound like it is trying to start.
I got frustrated and hit the gas tank and the sound of the pump changed. (got lower in pitch)
I tried the starter and, bingo, it started right up. Runs great after it starts and it will restart all day long. Next day, it's back to crank, beat gas tank, crank, beat gas tank, until the pitch changes and then it starts.
It sounds like the pump is cavitating, until I whack on it, then it begins to work right.

Could this be a sticking check valve and is it repairable?
If not a check valve then what else might it be?

Any help will be greatly appreciated since this has been going on for several months and is getting worse.
Very strange,
the pumps usually either work or don't ime, the banging on the tank is throwing me!!
so once you get it running and ride it's fine??
no misfiring or lack of power??
assumimg you say no then it's not vacuum related.
have you popped the pump out???
I can't remember if there's an inboard filter that might be part of the problem but what gets dislodged by a thump on the tank allowing the bike to be ridden but then resettles??
be great if you could borrow somebody elses tank and pump to try for elimination purposes!
I'd pop it out and take a look.
Be very careful putting it back though, easy to overtighten!!!!
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Old 05-28-2009, 01:17 PM   #3
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Quote:
Originally Posted by Grinchy View Post
Very strange,
the pumps usually either work or don't ime, the banging on the tank is throwing me!!
so once you get it running and ride it's fine??
no misfiring or lack of power??
assumimg you say no then it's not vacuum related.
have you popped the pump out???
I can't remember if there's an inboard filter that might be part of the problem but what gets dislodged by a thump on the tank allowing the bike to be ridden but then resettles??
be great if you could borrow somebody elses tank and pump to try for elimination purposes!
I'd pop it out and take a look.
Be very careful putting it back though, easy to overtighten!!!!
Thanks for the help.

Once it is running it is fine. I've done several track days since this started and the bike is great.
I guess I will have to remove the pump and see what I can do, I just was hoping for a suggestion of what to look for.
I believe there is a built-in filter that I can check, but it acts like maybe there is a check valve that ports excess fuel back to the tank, that sticks, so the fuel pressure is too low to operate the injectors.
That's just a WAG (wild guess) though.

Any other WAG's I can try??
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Old 05-28-2009, 03:50 PM   #4
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Quote:
Originally Posted by bumblebee View Post
Thanks for the help.

Once it is running it is fine. I've done several track days since this started and the bike is great.
I guess I will have to remove the pump and see what I can do, I just was hoping for a suggestion of what to look for.
I believe there is a built-in filter that I can check, but it acts like maybe there is a check valve that ports excess fuel back to the tank, that sticks, so the fuel pressure is too low to operate the injectors.
That's just a WAG (wild guess) though.

Any other WAG's I can try??
there will be a return but i'm sure it's electrical not mechanical,
there is a pressure regulator from memory, the race guys used to "modify" it to run higher pressure, I know that was true of the R6's.

there is a filter, see strainer
http://fiche.ronayers.com/Index.cfm/...roup/FUEL_PUMP

I would borrow a tank and pump assembly, 600 prob the same.
good peeps on here are sure to help
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Old 05-29-2009, 06:55 PM   #5
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Thanks for the help Grinchy. I can use that link to help disassemble and reassemble the pump.

I know somebody out there knows a little about how this stupid thing works.

Any body else have a suggestion?
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Old 05-30-2009, 01:45 PM   #6
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Quote:
Originally Posted by bumblebee View Post
Thanks for the help Grinchy. I can use that link to help disassemble and reassemble the pump.

I know somebody out there knows a little about how this stupid thing works.

Any body else have a suggestion?
pleasure
good luck, let me know what you find to be the problem.
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Old 05-30-2009, 01:57 PM   #7
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04 and 05 600 and 750 should be the same, I would just put a pump in it, they are cheap on ebay, motor is prolly dying
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Old 05-30-2009, 08:00 PM   #8
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Quote:
Originally Posted by FLYIN'DUC View Post
04 and 05 600 and 750 should be the same, I would just put a pump in it, they are cheap on ebay, motor is prolly dying
is that a "Fruedian Slip"?
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Old 05-30-2009, 08:40 PM   #9
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Sorry that is short for pump assembly, thats the way they are serviced
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Old 05-31-2009, 02:38 PM   #10
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There is an o-ring on the bottom of the pump that sometimes leaks slowly and will cause the pump to lose pressure over a period of time. Sounds like that's the problem to me. Look at #'s 7 and 2. I would replace them and see what happens. It's pretty hard to diagnose over the internet though.
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Old 05-31-2009, 02:48 PM   #11
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unfortunately I have lots of experience taking apart the 04-05 fuel pump. One thing you wanna be really careful about is that little black o-ring that was just mentioned. Not a bad idea to put a very light dab of thin, light grease to help the pump ease over that o-ring, otherwise you can tear or distort upon reassembly.

You can also remove the screen and clean it from the inside as well as the outside. Hopefully there won't be too much on the inside!!

The biggest PITA about the whole thing is separating the white electrical connector under the tank. I use the ignition key to push down on the tab to let the two parts of the connector slide apart. The key fits right in, and works great.
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Old 05-31-2009, 07:31 PM   #12
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Quote:
Originally Posted by bkeros View Post
unfortunately I have lots of experience taking apart the 04-05 fuel pump. One thing you wanna be really careful about is that little black o-ring that was just mentioned. Not a bad idea to put a very light dab of thin, light grease to help the pump ease over that o-ring, otherwise you can tear or distort upon reassembly.

You can also remove the screen and clean it from the inside as well as the outside. Hopefully there won't be too much on the inside!!

The biggest PITA about the whole thing is separating the white electrical connector under the tank. I use the ignition key to push down on the tab to let the two parts of the connector slide apart. The key fits right in, and works great.
1st, thanks GixxerCat.

2nd, When you say remove the screen and clean it, do you mean the screen under the pump or the main filter? BTW my elec connector is broken so it's easy to unhook.

I'm thinking #2 is a check valve that ports pressure back to the tank, maybe when the main filter is clogged or something. I believe it is the problem. (it looks like a check valve)

Thanks BKeros.

Unfortunately it is made so that it cannot be disassembled so I may as well get a used pump.

Anybody know where I can get a used '04 GSXR 750 fuel pump? Cheap?
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Old 06-01-2009, 07:56 AM   #13
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Quote:
Originally Posted by bumblebee View Post
1st, thanks GixxerCat.

2nd, When you say remove the screen and clean it, do you mean the screen under the pump or the main filter? BTW my elec connector is broken so it's easy to unhook.

I'm thinking #2 is a check valve that ports pressure back to the tank, maybe when the main filter is clogged or something. I believe it is the problem. (it looks like a check valve)

Thanks BKeros.

Unfortunately it is made so that it cannot be disassembled so I may as well get a used pump.

Anybody know where I can get a used '04 GSXR 750 fuel pump? Cheap?
I'd take a chance at that money

http://cgi.ebay.com/ebaymotors/Suzuk...Q5fAccessories
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Old 06-01-2009, 08:04 AM   #14
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Quote:
Originally Posted by Grinchy View Post
That's a sweet deal! Thanks,
I'm gonna watch that one
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Old 06-01-2009, 08:10 AM   #15
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I just bought several of his items yesterday, I have one in a tank I just bought and have another coming in another tank I just bought, I may wind up selling 1 of them, that is cheap, they usually go for more I bought 1 part yesterday that was at $5 for 4 days and in the last 5 seconds went up to 87.50, effin e-snipe
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Old 06-01-2009, 10:23 AM   #16
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That's a sweet deal! Thanks,
I'm gonna watch that one
No worries, good luck
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Old 06-01-2009, 10:25 AM   #17
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Quote:
Originally Posted by FLYIN'DUC View Post
I just bought several of his items yesterday, I have one in a tank I just bought and have another coming in another tank I just bought, I may wind up selling 1 of them, that is cheap, they usually go for more I bought 1 part yesterday that was at $5 for 4 days and in the last 5 seconds went up to 87.50, effin e-snipe
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Old 06-01-2009, 01:08 PM   #18
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Quote:
Originally Posted by FLYIN'DUC View Post
I just bought several of his items yesterday, I have one in a tank I just bought and have another coming in another tank I just bought, I may wind up selling 1 of them, that is cheap, they usually go for more I bought 1 part yesterday that was at $5 for 4 days and in the last 5 seconds went up to 87.50, effin e-snipe
So, are ya sayin' you just bought a tank with a pump that will work in my bike, and are you further saying you might be interested in selling said pump for a reasonable renumeration?
Or are you just toying with my emotions in some sick, twisted game of cat and mouse, merely for your own demented gratification?

Either way how much you want for it?
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