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For the short time that it runs, does it respond to the throttle?
When you turn the key On does the pump prime for a couple of seconds?Why were you attempting to jumper the bike in the first place, was there something wrong or just a flat battery?https://www.thisoldtractor.com/guzzi007/schematics/2004_750_Breva.gifWe need to know if the revolution sensor (2) is working, you havent had that out have you?The revolution sensor picks up a signal from the engine and the ECU turns On the Injection relay (12) which in turn powers up the injectors, coils and fuel pump.The best thing you can do at this stage is monitor the relay with a small lamp, that will tell you an awful lot about what's going on. Wrap a small wire around the 87 pin of the relay and run it to a small lamp with the other side grounded.When you turn the bike On you should see the light come on for a couple of seconds then go Off, it should come back On when the bike is cranking over to let you know the powers to all the vital parts.If you could check that and get back to us. BTW if you look at the relay (11) you will see it has a diode inside, thats called the safety diode, its there to prevent any damage if you accidentally put the battery in backwards. It won't let th relay close and put the wrong polarity onto the ECU.--------------You havent had the tank off by any chance, did you re-connect the pump properly?
Did you jump it from a car or a bike? A big jolt from a car could have fried the EI. Maybe pull and ground the plugs and check for spark.
To find out which relay is which I look on schematic and write down color of wires going to it. They are not always in same location on each bike. When bike is assembled they just hang them on, not always in same position.
A u haul trailer might cost less if you know someone with a hitch. Or make a post on Craig’s list asking for help. Maybe a nice biker with a trailer would help you out?
No. I have not touched revolution sensor yet, if thats what you mean. Had no reason to.I will be trying the lamp check like you said in post. I have to mention that the bike was suspected of having a bad fuel filter before this incident.Before this incident the bike would run normally only with full tank of gas. It would struggle to stay running when fuel ran out about 1.5 Gallons from the full fuel tank. I didnt get a chance to address that issue yet. I would just refill the gas tank when it would start sputtering/dying after using about 1.5-to-2 gallons of fuel.I am also thinking of checking/replacing fuel filter this time, after i get it running normally.
Guzzi is a relatively small community even worldwide, so much so strangers often are willing to help a fellow enthusiast.It might not hurt to keep us know where you are and maybe someone can help.
-----------------------I was wondering why would the low fuel light come up when the gas tank is full?Not sure if this points/hints/is useful info.
Update: Today I was able to locate the red wire with brown strip on the relay ( going by color in schematic ).I have stripped off about 1/4 inch from this wire near relay. Planning to attach a small wire with bulb to it as per your suggestion tommorow morning. Lets see how this goes.I was wondering why would the low fuel light come up when the gas tank is full?Not sure if this points/hints/is useful info.
The sort of information that would have been salient to mention in the original post. Personally I'd address the fuel feed issue including the tank venting before looking for other problems that may or may not exist.Ciao
The Breva is a thermistor.Here is a picture of the Breva 750 pump assembly and thermistor.
Both venting hoses are Not connected and saw that one of venting pipe is corroded a bit. I will try to reconnect, clean venting pipe.