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Discussion Starter #1
Let me go ahead and apologize for creating this topic, since I've seen its been covered multiple times, but i need some advice. I purchased 2008 Vstrom 650 (upgraded from a Boulevard S40) this past Friday and its been an absolute blast, until yesterday. It seems to freeze between 6k-7k rpm and stop accelerating under full throttle. It had been sitting for two years prior, but the guy had the bike up and running around for about a week before he posted it. From what i found on this forum, I need to look into the high pressure fuel filter and getting that replaced. Also i have a whine after start up, along with the almost dial-up like sound after flipping the kill switch with the key on. After taking it to my buddy at the shop and reading up it sounds like the fuel pump.

Now the reason i created this post is because I'm confused on a couple of things.

Is the sound from the fuel pump (whine) related to the clogged filters or could it be an issue with the pump itself? It just started yesterday along with the no top end. I've been looking at this for a replacement if so, does anyone know much about it, its the quantum t35, id post a link, but this is my first post.

I think i should replace the high-pressure fuel filter, but i read somewhere about a non-serviceable filter and im not sure what exactly to do about that. Should i look into just getting the changeable filters and clean what i can or shell out for the entire assembly?

I'm looking to do this work myself and was also curious about the bypass filter mod, but i think that only for earlier models, is this right?

I know I should've flushed the gas and done some more maintenance before this happened, but i was too excited and got stupid about it.
Thank y'all for all the info on this forum, seems like a great community and I hope to stick around for quite a while,
James.
 

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On my '07 Wee, I had to replace both the low-pressure filter (really just a small, simple strainer, if memory serves) and the high pressure filter.

My low pressure filter fell apart in my fingers. It was just.............gone.

The high pressure filter was easy enough to replace, with an OEM item, but, if you decide to do the work, when you pull the high pressure filter off the pump assembly - stop - and look very closely at the mating faces of both items. There's a small "bridge" piece of plastic or tubing that might come off with the old high pressure filter. You need that small item (need to put it on the new high pressure filter). I made the mistake of not doing this...

Beyond that, the symptoms of my bike is that it ran well from full tank (full gas tank) to about a half tank. After that, it ran poorly.

Don't know what to say about the sounds. I don't recall that whine on my bike. I also can't comment on the bypass. Lots have done that, apparently successfully, but, personally, I'd go OEM.

Good luck, regardless.

:smile2:

And welcome, btw!
 

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Discussion Starter #3
So according to the assembly picture here I think i need to order 2 and 7 for the filters. Does this seem correct? 15420-05H00 (for 2) / 15610-27G00 (for 7) labeled as part of the regulator?
 

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To potentially save a lot of $$$ use the google box on the top right of this page and search"fuel filter bypass" or something like that and do some reading. It's really quite a simple job and may correct the whining noise as it did on my pump.
 

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Discussion Starter #5
The only issue I'm having is finding a guide for the k7 and up wee. I've seen the guides for previous models and i assume the process is similar, but id like to really know what I'm doing if I'm gonna go drilling.
 

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If the bike has been sitting I would suspect rust in the tank. inspect what's going on and why that fuel pump filter clogged up so rapidly. There may be more problems than just the pump.
 

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Discussion Starter #8
I've now got the parts ordered and they should arrive Friday. Ill look into doing the bypass next time around. I do have one more question since you brought it up. I have looked into chemicals for cleaning the gas tank, but I'm curious which route to take. As far as simple things go, I've had people tell me about using 99% isopropyl alcohol in the tank and my automotive professor suggested using clean gas to shake around in the tank. I would like to believe that that'd do the trick, but I have a feeling that theirs something better i could do to help flush the tank and prevent future filter issues. What would y'all recommend for this procedure?
 

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You need to take the pump out and see what's going on. If there is rust then the process is much different then if there is just water and muck in there. Those you can just clean out.

I would not shake or do anything until the pump is out. You can empty most of the contents by running the pump, either repeated ignition switch activation or hotwiring the pump.
 

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Discussion Starter #10
At this time I have the gas tank off and the fuel pump out and stored, with the fuel pump hole in the tank covered. I wont be able to check it back out till i make it back to the garage Friday night or Saturday. Ill let you know what I find and report back, hopefully with pictures. I was looking for something to throw in the tank for it to sit overnight, but i didn't have the time to do a proper inspection and just made the point to get the pump out for repairs this weekend.
 

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In the schematic #2 is a small bag-like pickup screen. I have cleaned it as a maintenance issue to hopefully avoid problems.
So far so good. Over 210,000km on my 2007 DL1000 and no fuel starvation issues. And no bypass filter. I believe that my pump is a Mitsubishi manufactured pump and is used in thousands of small cars; many go further than most of our bikes and so pump more fuel over their lifespan. So I figured that a bypass filter wasn't necessary.
 

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Discussion Starter #12
Running Strong

Sorry for the delay in getting back to the forum with an update. I've gotten the bike back together with new fuel filters, air filter & breather, spark plugs, coolant, oil, gas, and a couple other things here and there. I have to say that I thought this bike was running strong and had power before, but I couldn't have been more wrong. This thing is a damn rocket compared to my Suzuki S40 (Savage). Not that I'm a speed demon, but i think I'm in love, I didn't think it was possible to replicate my love for the s40, but the wee does impress.

Anyways I've got a couple of pictures while i was working and i wanted to see if anyone could shine some light a finding, within the process.
As it can be seen in the 2nd picture the low pressure filter/screen was completely gone, it fell out the bottom when i took the last sleeve of the base of the pump and the connector was still connected inside. Now after i got the base revealed i noticed this build up. this yellowish substance that I believe has been formed from the evaporated gas from where it has sat for 2 years, does this sound right? i went through and thoroughly cleaned the pump assembly's components with clean gas before inserting the new filters.

Almost imidiately after starting on my test ride i noticed the high pitch whine (assuming from the pump) started back, but not performance loss or hesitation has been noticed the past couple of days. From what ive been reading hear i believe its the bearings within the pump motor itself. Now I do plan on replacing it, but if it does happen to go out on me am i at risk of damaging any other parts or just the fact of being stuck where it fails?
 

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Sorry for the delay in getting back to the forum with an update. I've gotten the bike back together with new fuel filters, air filter & breather, spark plugs, coolant, oil, gas, and a couple other things here and there. I have to say that I thought this bike was running strong and had power before, but I couldn't have been more wrong. This thing is a damn rocket compared to my Suzuki S40 (Savage). Not that I'm a speed demon, but i think I'm in love, I didn't think it was possible to replicate my love for the s40, but the wee does impress.

Anyways I've got a couple of pictures while i was working and i wanted to see if anyone could shine some light a finding, within the process.
As it can be seen in the 2nd picture the low pressure filter/screen was completely gone, it fell out the bottom when i took the last sleeve of the base of the pump and the connector was still connected inside. Now after i got the base revealed i noticed this build up. this yellowish substance that I believe has been formed from the evaporated gas from where it has sat for 2 years, does this sound right? i went through and thoroughly cleaned the pump assembly's components with clean gas before inserting the new filters.

Almost imidiately after starting on my test ride i noticed the high pitch whine (assuming from the pump) started back, but not performance loss or hesitation has been noticed the past couple of days. From what ive been reading hear i believe its the bearings within the pump motor itself. Now I do plan on replacing it, but if it does happen to go out on me am i at risk of damaging any other parts or just the fact of being stuck where it fails?
That's what the fuel pickup screen did in mine. It had gone brittle and came apart in my fingers. I replaced it and the HP filter/regulator assembly, keeping the old one to drill out for a bypass if needed later.
I'd suggest running some cleaner through the system, strong stuff, to get any gunk out of the pump, lines, and injectors before declaring the bearings DOA.
 

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I have an 08 and have done the external fuel filter by-pass. It was bogging down above 6k rpm and had a hard time maintaining speed on the highway.

You can drill the hole to relieve the High Pressure fuel filter similiar to the earlier vstrom. Just in different position to drill the hole.

everything else is pretty much the same. hardest part of the project is getting the fuel hose off on the engine side.
 

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Discussion Starter #15
I've been running Techron Concentrate Plus through the tank (about an ounce or so at fill ups, depending on how much i put in). I'd like to try BG44k or Seafoam, but I need to read up on the Seafoam procedure and I can't seem to locate BG44k around here. I know that the Techron is good for the injectors, but I'm unsure of its usefulness on keeping the Hi-pressure filter. Any recommendations on additives for the filters, if there is such a thing? I know alot of people stand behind the Seafoam product, but I don't know if it would do any better than the Techron I'm using now. I've only ran about a tank and a half out of it and I haven't seen improvements in the pump squeal as of yet.

Also i kept my old filter/regulator for the bypass, for when/if the time comes that I need it.

On a side note that i forgot to mention earlier; I managed to slice a bit of the O-ring last time i had the pump apart (the one that goes over the metal tube in pic #4). I don't think that it's enough to allow seepage (it does have a slight overlap, of the ring, after reassembling, from the tear, but its minimal). I'd like to replace it next time I've got the bike apart. Should i just take it into a parts house and look for the same size ring or is there something more specific to look for?
 

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Nice bike. I like the yellow.

That low pressure filter was the item that just disintegrated when I removed it from my '07 Wee, 4 years ago. Thanks for the photo. It helps.

As for cleaning and addressing the whining sound, I suggest just riding the bike for a couple months and see what happens. Personally, I'd use top-grade fuel (highest cost), for its cleaning abilities, during that time.

I'm glad your bike is running much better. V-Stroms are awesome!

:smile2:
 

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I've been running Techron Concentrate Plus through the tank (about an ounce or so at fill ups, depending on how much i put in). I'd like to try BG44k or Seafoam, but I need to read up on the Seafoam procedure and I can't seem to locate BG44k around here. I know that the Techron is good for the injectors, but I'm unsure of its usefulness on keeping the Hi-pressure filter. Any recommendations on additives for the filters, if there is such a thing? I know alot of people stand behind the Seafoam product, but I don't know if it would do any better than the Techron I'm using now. I've only ran about a tank and a half out of it and I haven't seen improvements in the pump squeal as of yet.

Also i kept my old filter/regulator for the bypass, for when/if the time comes that I need it.

On a side note that i forgot to mention earlier; I managed to slice a bit of the O-ring last time i had the pump apart (the one that goes over the metal tube in pic #4). I don't think that it's enough to allow seepage (it does have a slight overlap, of the ring, after reassembling, from the tear, but its minimal). I'd like to replace it next time I've got the bike apart. Should i just take it into a parts house and look for the same size ring or is there something more specific to look for?
Make sure you get the exact size AND fuel compatible material instead of a plain rubber o-ring or it will just end up dissolving.

As for the cleaners, they dissolve wax, gum, varnish ... that kind of thing. They can lift dirt out of the tank and lines, but that ends up in the filters. Really fine stuff that's gotten past the HP filter can be cleared from the lines and injectors but can sometimes require ultrasonic cleaning to remove if it's been allowed to build up. Techron etc won't remove grit from a filter since that's what the filters are there to catch. If the filters are blocking up with grit, it's time to replace them.
 

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Discussion Starter #18
So it seems that I'll get to do the bypass sooner than I hoped. Today I encountered a Max rpm of ~7500, after seeming to stutter above 6.5k. It just froze when it hit that mark. It's been less than a week and it's started cutting down my top end again. There's no doubt in my mind it's the hi pressure filter. I'm going to attempt to gather the supplies and do the bypass tomorrow. Should I look into cleaning my tank or taking it to a radiator shop? Or perhaps getting a handful of filters, for the bypass, that I can switch out and/or clean?
 

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Discussion Starter #19
Any recommendations on filters for the bypass? Ive found people talking about the Wix 33032 more than others, so I think that might be my first pick if it's available.
 
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