Clean out your Fuel Filters and Tank - and other tips!

[Mick_J]

Just turn the tank over onto it's back, the fuel cap is a good seal.

[Hooli]

Pretty sure GSXR are all the same too. It's just the cheap ones I've seen have all been listed as for Busas.

[MickyJB]

Ok. New HP filter turned up so off came the tank etc .. fitted the new filter, it came with a new pressure reg and plastic clip so was a simple fit and put back in ..  but now the bike won't start .. I've checked the fuel line connections and plug, hoses are tight .. fuel pump is working and it tries to start for a millisecond but then just turns over and over .   Can you flood a fuel injection system ?

I've run out of ideas why .  Almost at the stage of putting the original back in again and see if it fires up with that. 

[grog]

Mate, your on a black cat run with your bike, would drive me crazy. A squirt of carby cleaner in airbox will tell you if its fuel supply.Not sure of actions after that, regulator wired on? didnt get knocked off? EFI can flood, not un common but never heard of on 14. Try carb spray, new filter exact same?   

[Eric GSX1400K3]

Can't flood an efi, as there's no "bowl". It's a loop system, the pump just circulates fuel to the rail, any extra is recirculated back to tank. Check all the connectors are seated home, seems like you're not getting spark.  Fuel pump primes, so that's OK.  Also check you're not pinching the fuel hose under the tank and that the connector on the lhs is pushed home.

[grog]

Sorry Eric, flooded EFI is very common. I get it lots on jobs. Batt volts slightly down, worn plugs, injectors keep spraying fuel in, every time you try to start more fuel injected. Most cars, no idea bikes, clear flood mode is set by flooring accelerator, stops fuel pump. Most time it works, sometimes plugs out, new ones , bit of oil into cylinders as fuel has washed bores, less compression. Very common, start up produces clouds of unburnt fuel. I reckon i would attend 50 flooded a year.

[MickyJB]

Mate, your on a black cat run with your bike, would drive me crazy. A squirt of carby cleaner in airbox will tell you if its fuel supply.Not sure of actions after that, regulator wired on? didnt get knocked off? EFI can flood, not un common but never heard of on 14. Try carb spray, new filter exact same?   

So while I waited to see if that made any difference to flooding ... I did the filter mod and drilled the the hole. Tried the bike again and still no start, just a millisecond of a try but just turn over and over. .   So off comes the tank again and I fitted the old filter .. put it all back together and the bike fired up straight away ..  gave it some quick throttle and revs cleanly to the 8000rpm .. I bought the inline fuel injection filter but need to fit that tomorrow..

Suggestions on .. do I use the existing hose and cut it and fit inline filter or buy new hose and cut the old hose off trying to not damage the quick connects ...

[MickyJB]

new filter exact same?   

It looks the same except for the brass threaded holes you see on the aftermarket Hayabusa filter. It was a tighter fit but all went in and connected up the same ... after deciding to take the tank off the 3rd time I chose to put the original filter back in. Bike started up no problems.. yet to ride it and know for certain it's not fuel starving but it revs out cleanly not under load. Need to fit the inline filter now.

[grog]

Mate , if you can cut hose, locate filter, no need for new hose, not sure what i did but new roll of hose in tool box, guess i just cut original. efi clamps a must, not ordinary hose clamps, easy to buy. New filter must have a problem, cant understand that part.

[MickyJB]

I agree grog, and that's what my son suggested also .. knowing full well the hose is 16 years old .. but I'd like to try the simple way 1st, I can always cut and remove the quick connects at a later stage .. I'm keen to see if the bike revs out past 5000 under load ..

[MickyJB]

Pic of the new aftermarket filter I bought.

   Looks and fits the same but tighter to get on and off ... possibly tighter upset the O ring .. no idea just guessing.

[Eric GSX1400K3]

Sorry Eric, flooded EFI is very common. I get it lots on jobs. Batt volts slightly down, worn plugs, injectors keep spraying fuel in, every time you try to start more fuel injected. Most cars, no idea bikes, clear flood mode is set by flooring accelerator, stops fuel pump. Most time it works, sometimes plugs out, new ones , bit of oil into cylinders as fuel has washed bores, less compression. Very common, start up produces clouds of unburnt fuel. I reckon i would attend 50 flooded a year.

thanks grog, everyday is a school day, didn't think it could happen on an efi system. Thanks for correcting my understanding mate

[grog]

Clear flood mode doesnt stop pump as i said, it stops injector pulse. 👍

[MickyJB]

Update: the Bike is running and running great !

I ended up using the original HP filter with the drill hole modification and also a new length of high pressure fuel hose and inline filter. I was able to also use the quick connect fittings, it took me a couple of goes to get the hose length right so it fitted under the tank ok, new F.I inline filter sits just in front of the tank bracket.

Took it for a ride and bike revved out smoothly and quickly with no hesitation at any rpm.

Happy Days.

No idea why the bike wouldn't start with the new filter, possibly had I put the original pressure regulator on that may have made the difference. I'm in no hurry to find out why. 

[grog]

Mick, well done👍They do run nice with good fuel flow/ pressure.