So, there I was... 2010 Fatboy, not starting. Troubleshooting brought me to change the system relay, replaced fuel pump, and internal fuel lines. When attempting to start, I hear the fuel sound again, but followed by a weird spraying sound.

Took apart to look inside and had my son take a picture of the spraying fuel.

So first question is, what is the piece called? Guessing fuel filter assembly or something... And is it supposed to spray fuel or is the rubber o-ring just bad?




I appreciate all the help ! ~ Tim

 

I'd say get a FSM......but here is a good source.
And NO.......not supposed to leak........Change out the O ring.

http://partsfinder.onlinemicrofiche....UMP%20ASSEMBLY

 

Thanks. Looks like ill change that out and see if that works.

 

Change the filter also. You are there and they are cheap.

 

that is the fuel pressure regulator and housing,,,,and yes it will return fuel to the tank when the pressure in the line reachs and maintains the set pressure, that is the fuction of the metal part in the housing,,,,that being said, it should not leak from the o ring area.
m

 

Keep in mind what is leaking. On a modern FI motor, the fuel pump is on a timer when you first key on. It maintains the 60 psi. Once running or after ECM gets twenty or so impulses, it turns on pump which then runs all the time. The pressure relief bleeds off to 60 all the time. That way, FI is good all the way from idle to WOT.
You have a bank angle sensor that kills pump if bike is dropped.
Some Toyotas simple only run when cranking or running and have no prime. Back when cars had throttle body FI, the relief was at the fuel rail and has a vacuum line to it to make fuel pressure variable. It bleeds off more at idle.
You normally do not hear the relief valve unless tank is very low. However, many internal fuel lines have been changed over this.
Lot of times, the plastic housing is warped where that o-ring is.

 

One of the more common problems back then was the semi clear lines will rub on the inside of the tank and get a small hole in them. They will spray fuel all over the place inside the tank. Once you reassemble yours turn the key on with only about 1 gallon in the tank and check for leaks. If you have a fuel pressure gauge make sure it holds pressure for at least 10 seconds after the key has been turned off. The pressure range is 58 - 62 psi and it should hold that for 10 seconds after the pump is off.

 

Thanks everyone. I replaced the fuel filter and o ring. That fixed the fuel spraying all over. Once I put it all back together, it started up like a champ and rode fore the first time again with my boy in a couple years.

 

I just Love Happy Endings, thanks for sharing the conclusion with us!!