Yo all, Anyone know of a suitable fuel pump that retro-fits into the original? I have 2 now that are short on the metal body (75mm or so on OEM, overall length 110mm) and they are basically landfill - ebay 30 quid jobs. Need the metal casing correct as its used as an anchor clipping the pump in place. Im having real trouble trying to find info on the OEM pump i guess due to its age so any help appreciated. I have the workshop manual and its as good as useless for part numbers also. Photos of original included. Cheers.
The Bosch part number is 0580453408, my local supplier said they were no longer available. They are a very common pump though, there is a thousand different part numbers because each application has a specific intake filter. I think the one I bought recently was for a late 90's Suzuki Swift
So an update on this - Ordered a Kemso replacement and new fuel filter, the Kemso is an exact size match for all interested and comes with a multitude of strainers, none of which really fit but you can utilise 1 of them with some bending. Anyway, fitted and bike fires up..But it will not tick over. When i had the pump out, cleaned it all up, took the pressure regulator and cleaned it, refitted but had to re-use the orings as I dont have the sizes in any of my kits. My question is this. I think I am either starving the injectors with fuel at idle or I am not getting the air/fuel ratio. Note at >3000 RPM the bike revs just fine. I took this video - had to use dropbox as too large to upload here- https://www.dropbox.com/scl/fi/qgotviqy96pqub9ntm9xb/IMG_5804.MOV?rlkey=sev2zk6b9e4fj1mg6yu8hveow&st=3cs18b2u&dl=0 of the pump priming and can only assume that the spray is due to the pressure regulator opening due to pressure >3bar or whatever the stock setting is.. Anyone care to chime in? I should say that prior to the original pump failing, i didnt suffer any stalling or idle issues with the bike at all. It has been sat outside undercover since last August though. There are a ton of posts on the 749 stalling issues but as i said, ive never had probs like those, so am a bit stumped. Also for anyone who has to take the pump out, the sealing tank o-ring is a BS039. Cheers.
could be many things as usual, but as it was fine before, and I assume you've touched nothing else apart from pump swap, then I think I would probably try an air purge on fuel injector pressurised hose runs For starters. They nearly always purge themselves but I've had the odd stickler over the years. alternatively you could take the "do nothing "approach, and will probably purge itself if this is the cause.
yeh i was thinking may have to look at the injectors - dont want to tho for +20yrs old reasons...creating more problems along the way What do you mean by air purge? Also did you check out the vid - Can i assume thats normal?
Typically you would just "break" the union at each injector*, and/or a union at the highest point, the smallest amount until wet and then nip it up again and if you're brave even turn the ignition on/prime with fire extinguisher, towel etc at the ready and possibly repeat*. How long have you run engine since pump change? as said, above is unlikely, but no obvious alternative springs to mind.
hard to tell visually, but sounds fine. If you checked and doublechecked all hose clips for tightness (but not too tight!) then I'm sure it's fine. I can't remember if you said, but did you change fuel filter at the same time?
Yeh replaced the main and pre-filter. I am beginning to wonder if the new pump is over pressurizing the fuel feed, but obv that theory is negated by the pressure reg. Unless that is failing - but its a pretty simple mechanical device so unlikely. It is odd that by changing the fuel pump and filters i am now having the idle issue. At first glance it looks like fuel starvation but why does it rev pure over 3k rpm - I guess the air fuel ratio could be the cause or slightly blocked injector?I dont know but gonna have to start at basics i guess - measure the fuel pressure and go from there.. And there was me thinking it would be MoT'd and back on the road this wk...! The only other thing i can think may be causing this come to think of it is I used jubilee clips on the filter instead of the single use crimp type. I may just redo the fitting with the crimp type. I mean it unlikely to be the cause but ya never know...
I normally agree with your approach "if it ain't broke don't fix it" as to why should you suddenly have a an idle issue, but it's possible TPS and air bleeds need checking just in case? As said, if you haven't run it for very long then it's possible the idle issue could clear itself if run a bit longer.
