Fuel can not go out of the tank unless air can get into the tank to fill the void created by pumping fuel out. The gas cap has a vent built into it Chances are the vent is plugged up. The next time the problem happens, open the cap to let air in then close the cap back down. If the problem instantly goes away you now know the cap needs to be cleaned or replaced.
So humor me. Open then close the cap next time the problem comes up. I agree with your assessment, but even so .....
This one is a head scratcher.
Sounds like you are on the right track. Changing the subject, it used to be that when a comment was made I would get an email from fixya - at which point I would respond. Now they have it such that I only get the comment by clicking on "Recient Comments" and reading those that appear to be new. I would have responded sooner had the old system been in place. Sorry.
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Thx for reply 'Tombones' ........
According to workshop manual...the tank breathes through a breather pipe, and hence if filler cap was even sealed over, the tank should breathe freely, so I suspect that is not the problem. The bike always gives problem with exactly (say 4.5) litres of fuel left, suggests that it is sucking air through fuel pump....BUT...diagram of fuel pump in workshop manual
has filter screen at rear of tank very deep in tank, so looks like it should suck with a cup full of fuel left. Very strange....I was thinking of pulling out the pump...but....there is no adjustment visible in workshop manual diagram to raise/lower height of pump inlet inside tank...so I'm loathe to have a look at it.
My dealer was not helpful, and just rabbited on about
making sure that you do not run the pump dry as it uses the duel as a lubricant.
If it was a 'breathing'problem - I would expect that wehn I remove the filler cap, there would be a rush of air, but it just comes off as usual.
If all else fails, it looks like I have only 75% of my tank is usable fuel, and I don't think that is what Suzuki intended.
I'm about to take the tank off, and try and have a look isnide with a torch to see how how low to bottom of tank the inlet pipe is situated.
In the workshop manual there is a heap of electronic tests with fuel system, and problem could even be there if some sort of wrong signal is feeding to the ECU...but.....I could be playing around for years down that route.
PS Yes...I agree...in the end only kindness matters.
Today I took out the whole pump and had a look.
The filter was a bit blocked, so I cleaned that up as best I could and re-assembled. By the way....it's not possible for the pick-up to suck air at 4.5 litres left. The pickup is at the back of the tank at a very low spot, so it's designed to get all bar a cup full. For information....I ran a fuel cleaner through the tank about 1,000 km's ago, and this might have dislodged some junk, which then ran through the filter. I have my fingers crossed and am deliberately going to run the tank low and see what happens.
Well today I test rode the bike through the Adelaide Hills. Still cuts out under load. I changed the spark plugs back to what I had in before. Still cuts out under load. I described it to a friend as 'it feels like someone is switching the kill switch on and off'
He said that I should have a look at that wiring.
I'm going to give up and take it to the dealer.
Bike goes into shop next Wednesday. They think that pump unit is sucking air through some separation of the inlet pipe. When tank is filled up, air entry is covered by fuel, but when tank gets low, air sucks in.
Hello Tombones. Got the Bandit back from the shop. They found gunk in the fuel rail. They cleaned that and the injectors.
They suspect that the gunk might have been at manufacture, because it is after filter.
I have not tested the bike down to last litre or so in tank....so solution yet to be proved.
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