i was hoping for some assistance with my 1993 fzr1000 exup. she startsup quick easy and sound nice, but when i ride her she would cut out after a while, all different distances. id switch her of on again and she would start with the choke up again. could it be a shot fuel pump? how do i check it?
your fuel pump primes your carbs, so thats where you should be looking.
run the bike near to your home/on paddock stand outside with a fan on the radiator, until bike cuts out.
turn off ignition, remove fuel tank and airbox and find your carb drain screws. now you have 2 options.
1. find a small container and drain each carb into it, use a weiging scale to work out how much fuel you have drained from the bowl (so weigh container before fuel then after draining fuel)...do this for all 4 carbs. then put the fuel tank back on, turn ignition and kill switch on, turning kill switch on primes the carbs for 5 seconds, turn the kill switch from off to on 3-4 times to fully prime the carbs, then test how much petrol gets into each carb again...see if you have any differences.
or
2. instead of draining and weighing the fuel from each carb, get a short length of clear hose, attach it to the bottom of the fuel drain screw of each carb, make a mark on the hose thats parallel with part of the outside carb (so you can make sure that you put the hose in exactly the same place for each carb...i suggest somewhere near the top of the carb body), then open the drain screw and fuel should move into the hose a short distance. measure the distance from the mark you made on the hose to where the fuel is, do this for all 4, then as in solution 1, put fuel tank on, prime carbs and re-test.
if after this there are no big differences then i would suggest its something other than the fuel pump, possibly poor mixture in the carbs, or spark plugs breaking down under load?
also, you can test the fuel pump is working at all by disconnecting the fuel hose to the carbs, turn ignition on and kill switch on and see if fuel comes out, if you think its a problem with the fuel pump it could be that it works, but is not pumping enough fuel under load...you can only test this using the 2 methods above.
also the fuel pump is easy enough to dissassemble, could be that there is some dirt in one of the 1-way valves...its 5-6 screws on the end with the fuel in-out openings, then you can clean inside (if necessary). if its an electrical fault then go for a new pump.
also check to see if the tank vent pipe isnt trapped causing a vacuum and then fuel starvation. Is there a sudden inward whoosh of air when you open the fuel cap after it cuts out?????
I would start with the simple things as suggested above...
check the breather on the tank is working and test the pump is working properly.
Also make sure all the fuel lines are in good order and fuel is flowing freely.
Fuel filter been replaced lately?
How clean is inside the tank? .....these are "old" bikes so there may be a buildup of rust and sludge and Id assume the 1000 would have something like this thats on my 250
Hi guys. I for some reason never got a email saying some one commented. Thanx a lot. I kinda know bikes. So I have done all you guys metioned. So I sat and looked closely. When the fuel pump pumps for about 5seconds wich is normal hey on ignition on. She starts up fine. Then I let her run untill feul gets low untill she dies. So I've noticed the pump doesn't pump again. So that is clearly the problem. But why is the million dollar question. Maybe a sensor or relay? I have put in New plugs. New fuel and air filter. New fuel pump.new oil and oil filter. What else could it be , be a possibility?
if you get hold of the manual and look from section 8-77 onwards you can go through everything that you should be testing, but i think the simple answer (if your sure its electrical), is either the relay box or the CDi...they are the only things that come into play...unfortunately on this bike there is not a seperate fuel relay like on my zxr, the fzr integrates it into a combined "relay box".
hi thank you a lot. i cant say i am convinced but its just strange that the pump only pump on ignition on. and not again ever once the carb bowels are running lower. so im pretty baffeled. if i take the pipe off the tank it runs free. so its not in the tank. could it have to do with vacuum as the is two small pipes, one on either side of the fuel line intake on the carb. but theres no pipes connected to it.they just open. and if i close it the bike dies after about 20 seconds
Those two pipes are your bowl breathers, and have to be open to atmosphere, or else the vacuum builds up inside and - as you noticed - the bike dies very quickly.
If your pump is priming, but not running with the engine on, then it sounds like the TCI and relay box are each doing their job, but the back-pressure switch inside the pump is stuck. The first fellow to reply to your post suggested stripping and cleaning the pump - sounds like a good idea.
ok, because your pump fires up fine on the ignition, try to "over-prime" your carbs.
drain a small amount of fuel from each carb bowl, put key in ignition, kill switch off and turn ignition on, pump should fill carb bowls, you might need to turn ignition on/off a few times to fill them fully, once thats done the pump should sound different as all the carbs and fuel pipes will be full of fuel and the carbs wont fill anymore, this will sound different when you put the ignition on/off.
if this is correct then it shows that 1. pump will fill the carbs when empty, and 2. the pump operates under pressure, but wont overfill the carbs (you can check the overflows to make sure that your float heights are ok and that the carb fuel bowls are not overfilling).
If this is fine, then it has to be the CDi or fuel relay that is faulty.
Im not 100% on the fzr, but for my zxr the fuel relay is turned on/off by the CDi (like in the fzr) and its frequency is dictated by engine rpm, more rpm, the relay turns the fuel pump on more often, fuel will only flow if you have space in the carbs, but it helps to maintain a fairly-constant level this way.
Im guessing the fzr does something similar, with the difference being that upon turning the ignition on you also prime the carbs for 5 seconds. If this is the case then its most likely to be a problem with the CDi than the relay box...but i would be looking at replacing both.
hi banner001< thanx for the info. i have done that. yes i had to turn ignition switch few times and the pump does start sounding different. the relay has been replaced to its a new part. sapose im stuck to check the cdi box. any diy way? i checked the relay also. opened it and there two covered boxes in there that does the clicking wich seems fine. i think im going to seel it as is if i dont get to solve the problem.
id switch her of on again and she would start with the choke up again. could it be a shot fuel pump? how do i check it?
