Fuel filter in the 03-04 636??

varden · Post by **varden** » Thu Aug 17, 2006 11:40 pm

I can't seem to find anything that remotely resembles a fuel filter between the fuel pump and the fuel rail on my ZX6R track bike.

This only bothers me cos I've had some issue with misfiring and flatspotting lately....a problem i possibly would not have if there was some kind of fuel filtering.

I'd like the peace of mind of a fuel filter.

Question is if i add in an in-line filter between the fuel pump and the injector rail will the bike stop working properly due to a possible change in fuel pressure????

Nanna10r · Post by **Nanna10r** » Fri Aug 18, 2006 1:14 pm

Someone more 'kanically minded then i can answer the tech side of the querie Glenn but I can't imagine it doing any harm. If anything it would even out fuel pressure. Clean fuel has to be a good thing. Right ?.

Duane · Post by **Duane** » Fri Aug 18, 2006 2:21 pm

Vardy,

I assume (to make an ass out of you and me) that you run your bike on PULP. being a track bike, you dont go through the fuel so often as road riders do, and getting down to the servo (you can't just ride it)

This could be because PULP has a very short shelf life. Try flushing the fuel out completely and putting new stuff into it, may fix it (worth a try). Can't imagine any problems with putting a fuel filter in - maybe worth flushing the fuel, give it a go, then if not, splice the fuel line and put a filter in.

Also chuck a bottle of injector cleaner in (well not the whole bottle, but part there of, may be crap in the injectors)

Rusty · Post by **Rusty** » Fri Aug 18, 2006 5:53 pm

If it were me, I'd be putting a filter in before the pump. That way the whole system has clean fuel. Having said that, there'd be no real issue with a filter after the pump.

varden · Post by **varden** » Sat Aug 19, 2006 11:35 am

Duane wrote: This could be because PULP has a very short shelf life. Try flushing the fuel out completely and putting new stuff into it, may fix it (worth a try). Can't imagine any problems with putting a fuel filter in - maybe worth flushing the fuel, give it a go, then if not, splice the fuel line and put a filter in.

Hmmmmm that may well be part of my problem, the fuel that was in the tank at start of day was a mix of vortex and what was left from a trackday 3 weeks prior.

For session 2 i added some fresh BP 95 and some fuel injector cleaner, the bike got slowly better during session 2 and session 3 but after that i was back to using vortex and the problem came back with avengance.

I brought a fuel filter yesterday ($2) and I'll splice it in during testing to see if it upsets anything.

But from now on the bike will only be run on fresh BP 95, my car thats been runing on the same vortex has been playing up lately, hard starting and misfiring at over 5500rpm

it went back onto BP 95 this week and its getting better.

SocialSecurity · Post by **SocialSecurity** » Sun Aug 20, 2006 10:54 am

is the fuel pump inside the tank?

if so, make sure its an EFI filter not a thin plastic carby style one that might explode with ~40psi thru it

varden · Post by **varden** » Sun Aug 20, 2006 12:33 pm

Doh.....i doubt the $2 filter i brought was a high pressure volume one....

Yeah the fuel pump is in the tank.

blackninja · Post by **blackninja** » Wed Aug 23, 2006 10:23 am

you'd think theres gota be a filter did ya check the service manual disc

mitch179 · Post by **mitch179** » Wed Aug 30, 2006 12:02 pm

i reckon you should run BP ultimate in it .. thats what my bike was mapped on and it goes pretty damn good

i think you should pull down the fueling system and give it a good clean out and inspection dude, then put in the fresh fuel and go from there, its better to do the hard yards than search for a 'band aid' kind of solution imo!

SocialSecurity · Post by **SocialSecurity** » Wed Aug 30, 2006 4:14 pm

might be worth sending the injectors off to be carbon cleaned....

might also be worth getting it onto a dyno to try and work out whats causing the misfiring/flat spots.... EFI is supposed to be A1 most all the time, somethings not right