Hi Guys,
I'm having problems with my bike choking out at about 4500rpm. As a result, I decided to clean out my tank and fuel pump. However, as I was starting to remove the tank, I noticed that the fuel line that connects the pump to the tank is forced nearly 180 degrees, as it travels down and then back up. Is this normal and standard? The reason I ask is that it the bend is narrowing the fuel line and I think could be causing my problems. I have attached a photo to this post.
Please can someone confirm if this is a known issue. Please can someone also confirm a solution and whether I need to get some kind of u bend to stop it narrowing?
Cheers all for the help in advance.
Graham
Mate,not sure if youve done an intro post, its a usual first post. Anyway, low pressure hose has right angle moulded into it at pump end as does yours. Your problem looks like high pressure hose is under it and creating extra bend.
Thank you for your reply grog.
However, I can't see where the right angle is moulded in like yours is. It just seems to be regular pipe that's pushed onto a fitting that points down. Maybe someone replaced it before me and used regular pipe instead of the original?
Maybe I should buy a "Fuel Line Quick Connect 90 Degree Push-On Single Barb Fuel Hose Adapter Connector for 5/16 to 5/16 Rubber Tubing"?
I found it on Amazon here https://www.amazon.com.au/AUTOHAUX-Connect-Degree-Adapter-Connector/dp/B0B8ZXYCZ4
Sorry for lack of intro. Many years ago I was a member of gsx1400.org. I bought my k5 in 2008 when I lived in the UK. I emigrated to Australia about 8 years ago an bought it with me because I love it too much lol.
Mate, Dayco DSHB8F0 will solve your problem for $20.
I'd run it under the high pressure hose, but not worry about it.
That won't be the cause of your issue unless you're on rather low fuel at the time. Normally petrol pours in from above to fill the swirl pot, it's only on low fuel as accelerating that the low pressure hose you're concerned about does anything much. As petrol sloshes to the rear of the tank, it'll squirt down that hose into the swirl pot keeping the pump fed even if the tank is empty above it.
I'd be thinking more of a blocked up high pressure filter with your issue. You can either bypass it with an external filter as a lot of the Ozzies like to do, or look for a fake Huyabusa filter on ebay. They fit and are about £20 over here not the £170 Suzuki want for a genuine one. The only difference with the busa filter is two small brass threaded inserts in the top where the fuel level sensor fits on them.
That's assuming you've had the pump out & cleaned the teabag filter?
Quote from: Hooli on Thursday, 17 October 2024, 06:44 PMI'd run it under the high pressure hose, but not worry about it.
That won't be the cause of your issue unless you're on rather low fuel at the time. Normally petrol pours in from above to fill the swirl pot, it's only on low fuel as accelerating that the low pressure hose you're concerned about does anything much. As petrol sloshes to the rear of the tank, it'll squirt down that hose into the swirl pot keeping the pump fed even if the tank is empty above it.
I'd be thinking more of a blocked up high pressure filter with your issue. You can either bypass it with an external filter as a lot of the Ozzies like to do, or look for a fake Huyabusa filter on ebay. They fit and are about £20 over here not the £170 Suzuki want for a genuine one. The only difference with the busa filter is two small brass threaded inserts in the top where the fuel level sensor fits on them.
That's assuming you've had the pump out & cleaned the teabag filter?
@Hooli what would be your best guess on the fuel level for the system to become dependent on the LP side? Never thought about this before, but the slight hesitation issue that I had went away after trying many different things, last Friday evening I was down to two bars still showing on the gauge (very close to it going to one bar) and had done approx 150 miles from what was a full tank and twice I had a bit of sudden hesitation when I quickly opened the throttle, steady on the throttle and all was good. It did cross my mind that it may have been down to low fuel head, now I'm thinking it's more likely, possibly a restriction in the LP tank outlet, I did get a bit of gunk out of there years ago, maybe try a flexible brush/cleaner or just put the tank on that I bought 5 years ago and never fitted :facepalm:
I'd guess about that sort of level, I think that's when I used to see it occasionally too. I've got old & don't ride that hard as often these days.
Talking about dirt in there, Seth suggested a cheap fuel filter in that line, with the direction of flow going forwards towards the pump. It does trap a lot of crap & saves cleaning the teabag. I need to refit one, I had trapped the last one against the frame & deformed it so it blocked the fuel flow.
I use this one in line on the LP fuel hose:
Screenshot_20241018_161420_Chrome.jpg
How much resitance does this add to the flow? Will it impair the flow enough to make a difference in low-fuel level during acceleration of our little behemoth? Not an issue for me as I am highly unlikely to let a low-fuel level occur. :grin:
Fuel here is virtually void of crap. Only particles trapped in the HP-filter were rust. Only things (note: things - not particles) trapped in the teabag were left-overs from manufacture of the tank. Lucky to live here in this regard.
Back on kink topic. I replaced with a non-kinky straight thick after-market hose. No kinking, intended or otherwise, anywhere.
Doesn't make any difference I've noticed when the filter is clean.
Mine tends to trap little flakes of rust.
Just a little update on this, something was bugging me with the original thread & the bend in the fuel hose
I couldn't recall the low pressure hose on my bike having a 90 degree bend where it connects to the pump, just been out to the garage tonight and had a look under the tank, there is no bend in the hose as the tail coming from the pump swirl pot is at a 90 degree angle, I have also checked the spare pump that I have and that is the same. Although the part number of the pump assy is the same for all years from what I can gather the design of the swirl pot changed from K4 onwards, sort of explains why the low pressure fuel hose without bend for K2/3 is no longer available yet it is available with the bend from from K4 onwards
@Hooli or anyone else with a K2 or K3 I would be interested to know if yours is the same as mine or if I have a mongrel, unlikely as the spare pump is the same
On mine the connection under the swirl pot goes straight down, I don't recall seeing anything different even on later bikes I've fixed for people. I can't remember how the original hose looked though as I replaced it years ago.
Actually let me change that answer.
I've checked some old pics & can confirm the original bits on my K2 look the same as a friend's K5 when I did a load of work on it for her.
My K2 back in 2010 when the hose was original..
DSC00039.JPG
A K5 with the original hose etc in 2021..
Saras Tank (450 x 600).jpg
My K3. I have replaced the hose as its 22yo, but with generic auto motive fuel hose, plus the inline lp filter mod has been done.
20241025_163645.jpg20241025_163727.jpg
(https://es.aliexpress.com/item/1005001348885396.html?search_direct=true&gatewayAdapt=glo2esp)
https://es.aliexpress.com/item/1005001348885396.html?search_direct=true&gatewayAdapt=glo2esp
Thanks for the advice guys. Sorry for the late reply. I've just gotten around to getting my tank off and wow! It is rusty as hell and full of crap. I've emptied what I can but there is still fuel sloshing around in there. I ordered an external fuel filter as recommended and went for the proflow 30 micron fuel filter with 5/16 barbs (PFE610-05P) as used by some other forum members.
Does anyone have any tips for getting all the fuel and crap out of the tank? I'm going to probably use vinegar with nuts and bots but still can't get all the fuel out.
I bought these clamps to secure the hose to the filter https://www.ebay.com.au/sch/i.html?_nkw=5%2F16+fuel+line+clamp%23&_sacat=0&_from=R40&_sop=15
Also, I looked for that Dayco DSHB8F0 part to deal with the hose bend but the search results I get are for s bend fittings instead of 90 degree fittings. Does anyone have a links to a 90 degree fitting to deal with that hose kink?
Cheers everyone, Graham.
Oh dear, my tank and fuel pump are completely caked with rusty crap :(
file:///home/hat/Desktop/rusty%20pump%20compressed.jpg
Ewww that is rather rusty & manky!
hat, you have some work ahead of you, just very bad, maybe the electicity way as described by Andre. Tank, filter etc needs to be spotless in my world, biggest cause of bad running.
Quote from: hat22 on Wednesday, 30 October 2024, 03:45 PMOh dear, my tank and fuel pump are completely caked with rusty crap :(
file:///home/hat/Desktop/rusty%20pump%20compressed.jpg
I recon you have found your problem anyway. The HP filter will be full of that crud as well, the teabag may clean up but I got 5 from Ali-express for a few ££ also available on Ebay, so new cheapo Hayabusa filter off ebay, the hose that you need/want is I think part No 44128-42F10 from Suzuki UK £35.14, Webike Japan it is £7.84 plus the postage and try to clean up the swirl pot where the teabag sits. My original swirl pot was not quite as bad, I scratched about with a pick and wire wool and it came OK with rust remedy then I managed to find another that was much better but they are hens teeth things and not available as a lone part, comes with a complete pump which are about £550 on webike again. To get all the fluid out of the tank, stand it on its end and get a vacuum suction pump with long hose on should work, or swirl it around with pump and sender unit removed should also work. Nice little project but the benefits will be massive
Hi Guys, I managed to get everything out by getting a shop vac and sucking it out of the tank. This worked quite well.
I've got the new filter in the post (proflow 30 micron fuel filter with 5/16 barbs - PFE610-05P) along with some 13-15mm Jubilee clips.
However, I've only just realised that I can't reuse the old fuel line. I notice people saying that you just use any EFI fuel hose. However, they seem to come in a bunch of different sizes. From what I can deduce, the hose I need is 8mm or 5/16 EFI Fuel Hose. Is this right?
Also, just as a double check, it is the pictured hose below that I replace with the new hose and proflow filter, right?
Cheers , Graham
Yep, that one's busted. :onya:
Mate , on the right track. Use proper EFI clamps, a bit of pressure in those hoses. Any 8mm/ 5/16 efi hose. You can use old hoses but thats it , they are old. JIS connectors will cut out of old hose, single side razor blade, be careful, fingers slice easily.They are tough to get into new hose, hot water& patience will work. Filter will locate centre rear of tank, make a bracket, Snapey one is on here somewhere, mine just lives in an old foam stubby cooler with cable tie around it, never a problem. Lets know how you go👍
Nice! Love the good use of stubby holders.
Cheers guys. I ordered the 5/16 (8mm) EFI hose today and will pick up some smaller jubilee clips for it soon.
I'll do as you suggest Grog and let you know how it goes.
Graham
You need efi high pressure clamps Mate.bolt type are far better than worm drive.
Make sure the fitting
Whatever kind you go for is up to the job and can take the correct pressure last thing you need is it coming off when your riding far from any help or at a higher speed.
A mate had a custom line due to the bike being highly modified and used the wrong kind of hose and clamp the clamp damaged the hose and it parted several times till we got proper reinforced petrol hose (if your cutting the standard hose it's fine but will still need the correct clamp)
Just wondering who has done significant mileage on one of the knockoff hayabusa fuel filters ? I think after a couple of cleanouts its time to turf it not keen on the oem route and not ready to go the external filter yet.
Thanks
TBH I've not fitted mine yet, it's sat on the shelf for when I need it.
Quote from: Horse on Saturday, 23 November 2024, 01:23 PMJust wondering who has done significant mileage on one of the knockoff hayabusa fuel filters ? I think after a couple of cleanouts its time to turf it not keen on the oem route and not ready to go the external filter yet.
Thanks
"significant mileage"??? 8k km ago into very clean (!) tank installed. No problems so far noted. No, I have not tested its filtering qualities. That's the main criteria! Not tested its resistance to the pump either. Flow and pressure after it are ok. Your mileage may vary depending on their quality control, the dirt in your tank, and your fuel quality. Goes for the oem stuff as well :coffeescreen:
I'll be happy to test it if someone sends me an oem filter, a knockoff filter, a pump, and other needed stuff (all new). :rofl2:
Hi Guys, I finished the mod after and put everything back together. Wow! I forgot what it's like to rev freely throughout the whole range without any stuttering. My bike is running beautifully now. Supper happy. Gave it a good spanking yesterday and it's an animal :D :D
Great result, so nice when they free rev. Initially clean filter out a couple of times at small intervals, youll know by amount of crap in it.Job well done👍