| Author | Message | ||
     Turbo6bar |
I purchased my 08 12XBXT in May and have had problems with starting and running well. I posted here and was advised to reset the TPS and ride it to allow the AFV to adjust. I did that and was able to ride the bike. Nevertheless, it never started well and running was never quite smooth. One thing that clued me to ongoing trouble is the bike started easily if I spritzed a bit of starting fluid into the intake. Fast forward to a few weeks ago. I got Ecmdroid on my phone and an Xoptiinside bluetooth module. I was surprised to find the AFV was 147. If I reset the AFV to 100, the bike simply will not start. It'll keep turning over. Spray starting fluid in the intake and it starts easily. I wanted to check fuel pressure. I slowly removed the line and noticed it had zero pressure. Using Ecmdroid to do a fuel pump test (30 seconds of run time), the pump output is less than 2 L/minute (under 1/2 gpm). That seems awfully low, considering some have cross-referenced this pump over to Ford cars and trucks. I think the pump is worn out (why for less than 10k miles), or the bushings on the inlet or output of the fuel filter are not sealing. I pulled the pump housing, and I cannot find a definite issue. I am going to make a new set of bushings for the fuel filter and put it back together. If this does not solve it, I am thinking of buying a new fuel pump assembly from AmericanSportBike. Am I missing something here? Could be pump or regulator, but I don't know how I can get an aftermarket pump that will accept this strainer. The fact fuel pressure bleeds down suggests I have a leak after the regulator. Jurgen | ||
| Rayycc1 |
I had a problem with the bushings not sealing and the pump was blowing pressure right back into the tank,,,made new bushings out of fuel line ( can't buy the bushings) and have had no problems ever since. Edit...my bushings actually got hard and brittle | ||
| Rayycc1 |
the pump and filter from a 93 mustang will work just fine at 1/3 the price...just get the strainer for the new pump. | ||
| Tootal |
Sounds like Ray has your answer but I have a stupid question. Does Buell have the filter before or after the pump? The reason I ask is my BMW K bike had it after the pump and it was aluminum. It cracked and was dropping my fuel pressure so if Buell puts it after the pump you might check it out. If not, never mind!  | ||
| Pagprivat |
Strainer on the suction side, filter on the delivery side. I'd buy a pressure gauge, a tee junction and some hose, to see what kind of pressure you get when driving, not just what flow with zero restriction. I bought one of these for my spare parts inventory, haven't tested it yet though: http://www.highflowfuel.com/i-13398610-new-intank- efi-fuel-pump-buell-ulysses-xb12-xb12x-xb12xt-2006 -2010.html | ||
| Turbo6bar |
I bench tested the pump by itself. I pumps a healthy 2L per minute open flow and 54 psi dead headed. It seems to be OK. I then tested the pump with regulator and filter. I only get 12 psi at the outlet of the filter and fuel is coming out the overflow hose. I am starting to lean towards a bad fuel pressure regulator. It is marked 338 Kpa, which is almost 50 psi. Seems to me that fuel should not be coming out the overflow if the pressure is only 12 psi. Jurgen | ||
| Rayycc1 |
agreed | ||
| Turbo6bar |
Update. I tested the pump again with a pressure gauge in a T-fitting. I crimped the end of a fuel hose with a pair of pliers and the pump would pump easily at 50 psi. That proves the pump is good. I decided the fuel pressure regulator was bad. I pulled the regulator from the housing. The o-ring at the bottom of the regulator was torn. In fact, the o-ring had a crimp where it had been installed improperly, likely from the factory. I imagine my bike was built at 4:45PM on a Friday afternoon. I installed an o-ring from my o-ring kit, and it all works well. Now, I have to wait for the viton replacement to arrive. The o-ring is 5/16" ID and 1/2" OD, and is commonly referred to as a 109. Wish I could find it locally, but I am striking out at automotive stores, small engine shops, and industrial supply houses. Wow! Jurgen | ||
| Natexlh1000 |
Sounds like you are close to winning this one  | ||
| Hughlysses |
50 for $5.04 from McMaster-Carr: http://www.mcmaster.com/#o-rings/=ur339w | ||
| Pagprivat |
Agree, sounds like you're close to sorting this out O-rings that is nominated 109 has these dimensions: 1/2x5/16x3/32 in US, and 7,59x2,62 in EU. Same size as on the clutch wire entry to the primary, but unfortunately that one is nitril... A normal hydraulic repair shop should have it in viton though. | ||
| Tootal |
Woo Hoo! Love it when you actually find something wrong! Good job of troubleshooting! Yesterday we had 42 psi oil pressure on a large v-twin CO2 compressor. Today we had .4 psi! Checked the oil pump and all looked good. Checked the filter and again no problem. Checked the pick up tube and felt something gooey. Pulled the whole filter assembly off and pulled off the pick up tube and found a finger from a latex glove! I think it was the middle one and it was aimed right at me!!  | ||
| Turbo6bar |
I wanted to post an update to my sick XT. mcmaster.com is a great place to get all sorts of hardware and bits, but I had already ordered the viton o-rings from amazon.com. I replaced the o-ring and got it all back together. I reset the AFV to 110% and tried to start the beast. She would not start, and after the pump stopped, I could hear fuel spraying inside the tank. Figuring the fuel pressure was bleeding off inside the tank, I decided to replace the rubber bushings on each end of the fuel filter. I used 5/16" fuel hose rated for submersion in fuel. Gates 27039 and ACDelco 32306 are 5/16" fuel hose that have the J30R10 specification. I used 180 grit sandpaper to whittle the O.D. down to the right diameter. I put it all back together and finally, my bike is running well. It starts easily and has unholy, ridiculous power. I believe the broken o-ring was an anomaly and perhaps even a flaw from the factory, so it may not be a common problem. However, I do believe more Ulysses owners will run into a problem with the rubber bushings on the fuel filter. I am not a fan of the design. It is prone to leak fuel pressure with the passage of time. I think every owner should consider replacing the bushings if the fuel pump is ever removed. Cheers, Jurgen | ||
| Turbo6bar |
BTW, symptoms of the fuel system not building pressure: 1) can remove the quick disconnect near the injector and have no pressure 2) when fuel pump cycles on to build pressure (engine off), the tone of the pump will get deeper as it works to build pressure. Hope this helps. | ||
| Reepicheep |
Excellent info Jurgen, thanks for taking the time to share. Complete with part numbers even! |
