Throttle hesitation R1100GS - Page 3

roger 04 rt · 12-03-2012, 07:08 AM

Good luck with this. I might have mentioned it but if there is a way you can measure the volume of fuel returning to the tank when the bike is idling, you can get a good idea of the whole system. There should be about 2 liters returning to the tank per minute. Other than you're relying on the fact that the fuel pressure regulator is working, the return volume test is checking the pump, filter and in-tank hose integrity.

NW Cascade Rider · 12-07-2012, 08:34 AM

Its a fuel problem. It has to be. I Installed the new TPS. It seemed to help a little. But it was still having issues starting. I so grabbed some starting fluid from my beetle and gave it a squirt. sure enough it roared to life without hesitation and ran great until the fluid mist ran out. So then I thought if it was a fuel restriction problem I could disconnect the return line only to help build fuel rail pressure. It didn't help, and listening to the fuel pump, it didn't seem to be like it was building any additional pressure. So I went to the auto parts store and bought 6 ft of fuel line and 6 ft of smaller line for the in tank breather line as well as an external mount fuel filter. So tonight I am going to hook all of this up and hope it fixes it. I WANT MY BIKE BACK!!!!!!!!

mouthfulloflake · 12-07-2012, 08:50 AM

Did you get the proper submersible high pressure fuel line for the lines in side the tank? ( the proper stuff is 5/16" SAE J30R10) its about $18 per foot i think.

and what will you do about the "U" shaped peice? its $35 from BMW, you cant bend a tight enough radius with the submersible fuel line.

RAL88 · 12-07-2012, 11:30 AM

As was mentioned earlier just mount the fuel filter externally. I replaced my fuel filter in the tank and then 500 miles later got a bad tank of gas and had to replace it again. That's when I moved it to the outside and it made things so much easier. You can easily bend the fuel line that replaces the filter.

NW Cascade Rider · 12-07-2012, 08:03 PM

Yeah I bought a large filter to mount externally. I also got some brass fittings that I am going to use for the 180 deg angle I'm doing all this fun stuff tomorrow. Ill check back when I got it done.

roger 04 rt · 12-07-2012, 08:13 PM

It will be interesting to hear about the condition of the hoses that are in the tank. I ended up having to dissect mine after removal to find the cracks. I decided to leave everything in the tank.

12-07-2012, 08:34 AM	#32
NW Cascade Rider ^OP Dual Sport Joined: Oct 2012 Location: North Cascades Oddometer: 19	Update Its a fuel problem. It has to be. I Installed the new TPS. It seemed to help a little. But it was still having issues starting. I so grabbed some starting fluid from my beetle and gave it a squirt. sure enough it roared to life without hesitation and ran great until the fluid mist ran out. So then I thought if it was a fuel restriction problem I could disconnect the return line only to help build fuel rail pressure. It didn't help, and listening to the fuel pump, it didn't seem to be like it was building any additional pressure. So I went to the auto parts store and bought 6 ft of fuel line and 6 ft of smaller line for the in tank breather line as well as an external mount fuel filter. So tonight I am going to hook all of this up and hope it fixes it. I WANT MY BIKE BACK!!!!!!!! __________________ 95, R1,100 GS 99, E46 323I, 2.5 05, E53 X5, 3.0 82, E24 635CSI, 3.5 Eat, Sleep, BMW.

12-07-2012, 08:50 AM	#33
mouthfulloflake Not afraid Joined: Aug 2008 Location: N.W. Arkansas Oddometer: 11,221	Did you get the proper submersible high pressure fuel line for the lines in side the tank? ( the proper stuff is 5/16" SAE J30R10) its about $18 per foot i think. and what will you do about the "U" shaped peice? its $35 from BMW, you cant bend a tight enough radius with the submersible fuel line. __________________ "A little inaccuracy sometimes saves a ton of explanation." - H. H. Munro (Saki) (1870-1916)

12-07-2012, 11:30 AM	#34
RAL88 Marineboy Joined: Feb 2011 Location: Albuquerque, NM Oddometer: 62	As was mentioned earlier just mount the fuel filter externally. I replaced my fuel filter in the tank and then 500 miles later got a bad tank of gas and had to replace it again. That's when I moved it to the outside and it made things so much easier. You can easily bend the fuel line that replaces the filter. __________________ Rich ____________ '96' K1100LT-SE '97' R850R-GS "If it ain't broke take it apart and make it work better"

12-07-2012, 08:03 PM	#35
NW Cascade Rider ^OP Dual Sport Joined: Oct 2012 Location: North Cascades Oddometer: 19	Yeah I bought a large filter to mount externally. I also got some brass fittings that I am going to use for the 180 deg angle I'm doing all this fun stuff tomorrow. Ill check back when I got it done. __________________ 95, R1,100 GS 99, E46 323I, 2.5 05, E53 X5, 3.0 82, E24 635CSI, 3.5 Eat, Sleep, BMW.

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12-03-2012, 07:08 AM	#31
roger 04 rt Studly Adventurer Joined: Nov 2011 Location: Massachusetts Oddometer: 815	Good luck with this. I might have mentioned it but if there is a way you can measure the volume of fuel returning to the tank when the bike is idling, you can get a good idea of the whole system. There should be about 2 liters returning to the tank per minute. Other than you're relying on the fact that the fuel pressure regulator is working, the return volume test is checking the pump, filter and in-tank hose integrity.

12-07-2012, 08:13 PM	#36
roger 04 rt Studly Adventurer Joined: Nov 2011 Location: Massachusetts Oddometer: 815	It will be interesting to hear about the condition of the hoses that are in the tank. I ended up having to dissect mine after removal to find the cracks. I decided to leave everything in the tank.