| Author | Message | ||
     Interex2050 |
After much deliberation, the conclusion was made that my fuel pump was bad. The attention was drawn to the pump after the low-fuel sensor went out. Then the service guy pointed out that my fuel pump was overly noisy, so it was replaced. After it was replaced... quite a difference apparently the pump was not producing enough pressure and creating a lean condition. The engine has become much smoother, and without ping. Also: either my old pump was in really bad shape or the new generation of pumps it nearly silent. Can anyone confirm that the new pumps are "silent"? | ||
| Diablobrian |
During the Ulysses talk session Erik & Co did confirm they had changed the design of the fuel pump to get rid of the cavitation (noise caused by bubbles in the pump impeller area). The new pump also is intended to prevent fuel starvation during hard braking at lower fuel levels. | ||
| 99buellx1 |
^^^^True | ||
| Typeone |
you know, this has been a wonder of mine! i have ping like mad on hot days, i've messed with the TFI trying to 'fatten' things up as much as possible with not much success and my fuel pump keeps getting louder and louder. shop says its fine but George at Dobeck had mentioned to me last season they were seeing A LOT of pumps that coun't hold their pressure properly. hmmmmm. i'm experiencing surging at ~3000 RPM whether the TFI is hooked up or not. i've even completely taken it off the bike one time to make sure. same strange ping and surge condition. my next plan was to find out if one of my injectors was gummed up or something. seems odd for a bike with ~5500 miles on it though. now i'm really wondering if my pump is going south. i also just bought new plug wires to make sure those are nice 'n fresh. i saw an arch when she was wet the other day. just making sure those aren't rubbed through causing the miss/surge issue. but your post really makes me wonder... could all this end up leading to a fuel pump that is amiss??? now my trick is either testing the pressure myself somehow (???) or getting my dealer to test it which will be impossible. i've kinda already talked about it and they brush it off as 'normal' grrrr. EDIT: how loud was your pump sound? completely noticeable, more then when you first got it, noisy whether full or empty, varying in pitch? (Message edited by typeone on April 15, 2006) | ||
| Sub65chris |
just asking but my bike has been alomst "missing" under acceleration . the bike wants to go but at around 4900-5300 rpms is is almost like the ignition cuts out . Ive had the dealer look at it and they said it was fouled plugs but after the plug change it still does it to a lesser extent . Do you think it could be a bad pump?  | ||
| 007firebolt |
Interex: How many miles were on your bike when the pump was replaced and was there a certain spot in the power band/RPM's that you noticed the ping? I'm having similar problems, so any info would be a great help. | ||
| Interex2050 |
Typeone, I am not sure as to how the dealer tests the pressure, but I do know that the pump is designed to operate at around 49psi. The first thing that comes to mind is splicing a pressure gauge into the fuel line (although there is probably a much easier way... but if you decide to do it, keep in mind that the pressure in the fuel system remains elevated even after shutting the engine off) As for the noise levels, the pump had a mind of its own. Some days it would be really vocal, other days it would just be almost like a hiss. The fuel level had no effect on the pumps mood. Sub65chris, I do have to agree that the pinging does somewhat remind one of the rev-limiter... It could be that the fuel pump is going bad, mine would misbehave below 3500rpm... 007firebolt, my bike had 7120 miles on it when I had it replaced. My low fuel sensor died at about 6800 miles. My bike would ping regardless of the air temperature below 3500rpm, under deliberate acceleration (not smashing the throttle open but quickly following the rising rpms with the throttle). Also... With my old fuel pump I would get poor fuel mileage on the street (30-35mpg), decent on the highway (40-45mpg), and here is the strange part... excellent in the canyons (50-55mpg). I could never understand that the most rigorous conditions would produce the best fuel economy. So I have a feeling that with the new pump I will have some new data soon. Maybe the odd fuel economy could also be a tell-tale sign of a bad pump. One more thing, toward the final days before the pumps replacement, it would starve the engine. The engine would literally gasp as I was riding along, and jerk violently. | ||
| Sub65chris |
exactally it cuts out then catches itself and bucks like a very hard acceleration . i'm going to the dealer tommorow and discussing it with them and mabye change to the new 06 silent pump. Its wierd because i get the same fuel economy you were getting , and when I ride hard it gets better ? very strange , anyway thanks later | ||
| Typeone |
right, I've had the 'starve' thing happen on the highway where i'm cruising along and then the bike acts as if its not getting fuel. almost cuts out, then surges back into action. only happened a few times but the sound of the pump is definitely getting louder/weirder and at constant mild cruise its like the injectors are squirt/stop/squirt/stop. this happens whether i have the TFI installed or not so i'm pretty sure its not that. i have no idea. gonna just keep replacing stuff to try and track it down. this season i'm going to throw a new O2 sensor in too. already been through plugs of all sorts, new wires from Iron Machine going on this week and i've got a question in to DaveS about the cost of an '06 pump. | ||
| Sub65chris |
took the bike into the dealer and had them look at it . they checked the fuel pressure and it was good . The next step was for them to check the wires to the pump. they found the two wires that run to the bottom of the pump plate were rubbed through the insulation and were sparking . They repaired the wires and replaced the pump because they were worried that the pump was dammaged by the short . it sounds like they were fishing for something wrong but the parts were covered under warrenty so no big deal hopefully its fixed . I asked about the filter that mabye it was clogged but they assured me that it was a 100000 mile filter ? has anyone heard anything different ? anyway i will keep you posted about the outcome i have a 400 mile ride coming up so it should surface if the problem is still there . later | ||
| Lorazepam |
If you get some really dirty gas, or some with water in it, I will bet you the filter wont last 100000 miles. |
