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Gmc28

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Gmc28 last won the day on March 11

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    Portland area, Oregon
  • My bike(s)
    02 LeMans (stable twins: 1 red/silver + 1 champagne), 00 Greenie, 99 Cagiva GC, '16 multistrada, KTM 990 ADV, Suzuki DR350/441, 50cc Vespa!

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  1. sounds about right. i'd say just lack of fuel, like with most other pumps which start to howl when they run out of fluid to pump. however now that you mention it the fact that it ran smooth/quiet when bench tested, dry, means that just running dry isn't the issue, but instead would be a pressure issue, as you've noted. whether that would be a drop or an increase..... i'd think the flow was decreased and the pressure increased downstream of kink, which is upstream from pump. getting into the weeds a bit, but interesting. I can just confirm that uninterrupted flow = happy fuel pump.
  2. This is perhaps old news for some, and it may never be valuable info, but for what its worth, the howling sound that may come from one of these fuel pumps can be good ol’ fashioned cavitation. MGcycle sent me a new pump lickety-split, but it was still bothering me why this original new pump they sent me was howling. Maybe Sucked in some grit stuck, or was it somehow mounted too tight and causing the case to rub on the internals (i knew that wasn’t it), or?? Bottom line is that when i pushed up hard on the main fuel line from the tank to the pump to ease the L-shaped “kink” in the line, the same kink that was there from before all this project started (same hose, same routing), the howling stopped. Removed line, shortened it and re-routed it slightly, and problem solved. So i’ll send this un-used new pump back to them (which they sent me no charge)… with a little egg on my face.
  3. The beast is alive. She starts and runs sweet now, and looks nice and tarty…. However, the new/replacement fuel pump works, but is buzzing loudly, so the good folks at MGcycle are sending along another one. Now can get that thing off my lift, after way too long, and make room for Red, who needs her annual shop-love. In other news, the beloved KTM 990 will go for sale very soon, as its time, and is the opportunity to remove the final Germanic influence from my garage.
  4. I can look for the other source…. But I think the other one was also German, so probably lousy shipping cost options there also.
  5. Good thinking. But it (tank) was clean and dry for the paint work… so if there’s a smoking gun beyond just an old, bad pump, then my little brain leans toward something related to paint…. Residual tape, or overspray, or that kind of thing. I’m good/careful with that stuff, but last I checked I’m still human, so prone to some error (am still hoping for an android upgrade, like Steve Austin, or Wolverine) Might just be chasing ghosts, as the pump may be all there is to it. Will know when the pump shows up next week. Already have a new filter installed now… had a spare for red sitting on shelf.
  6. Agreed. Never have before and didn’t need to, but sounds like a good idea. I was just surprised there was that much residual pressure in the line 24hrs later. But maybe it shouldn’t a surprise…
  7. for sure replacing pump and filter. On order. Did a quick check on the two little vent lines today, and they seem fine: 1 to the charcoal canisters, and 1 to the ground(bottom of bike). The one to the ground has the one way check valve in-line, which worked fine…. It will allow air/fuel to exit tank but not draw back in. Now that I’m caused to think about it, am wondering how the tank vents air IN… via the breathers on the gas cap ring area, or just via the charcoal canister pathway? But also has me thinking about how the return fuel line to tank, the one that goes to right/rear side of tank and into that reg there. How does one test that? When I pulled that fuel line off, the line was quite pressurized…. Sprayed a good bit of gas. I expected it to drain some, but not spray it so forcefully. I had not run the pump since yesterday. thoughts?
  8. All makes some sense. For sure am replacing the filter too. And I’ll see if i can force some air through the tank vents. New pump and filter are enroute….
  9. Certainly comes to mind, and i have a new filter coming as well. I’m just thinking that even though it’s been sitting for a couple years, which is no small thing when considering causes for issues, but it did run reasonably well before it went into the surgery room. So, new paint on the tank i can’t help but be suspect of… tape, overspray, or something like that perhaps. Gotta get back out to shop and check the return line and vents. Just hard to get motivated to get my butt back out there, sitting here by the fire…
  10. Yessir, that’s the one in my basket with MGCycle. But am still thinking about whether there was more to it…. Did it just fail from sitting there and aging, or was it helped along toward destruction because of something else. Still wondering why it sprayed more fuel when i had the tank cap closed then when it was open. Venting issue comes to mind, so I’ll check for that, but even then why would it behave like that?
  11. Crank case now vented properly. And she’s all buttoned up, TPS set, CO trim good, valves & plugs, good, TB’s themselves were a mess inside (another reason to not use pods), and last thing left is TBS. Alas… key on, fuel pump gives reassuring whirring sound, but then i notice fuel spraying from positive electrical connection point on the pump. Hmm. Repeat action, same result. Thinking its maybe ricochet from elsewhere, but confirmed its from the positive terminal spot. Only sprays while the pump is running, and its cycling off properly after initial prime. Open the fuel cap on top, and the fuel geyser when pump is on goes from an aggressive spray down to a tiny dribble. So that means tank venting seems logically suspect. Tank was painted, so maybe something got messed up with paint, or my tank vent lines i messed up when installing (unlikely, as thats pretty simple, but I’m certainly not immune from doing the occasional stupid/oops). Or it’s just a bad pump, and all will be well when i replace the pump. Pump runs great, so it’s a bummer, but combo of age, ethanol fuel, and having been sitting for a couple years up on the rack in the shop…. Who knows. Thinking I’ll just order the pump, unless anyone has any other wise thoughts.
  12. audiomick and lagrasta, all sounds good. I saw some of those threads, where folks talked about a lot of oil coming from the breather/system, and some saying that wasn't the case for them, but those seemed to all be in regard to the actual case vent (hose). On this greenie the breather hose is in place and looks intact, the infamous one that is prone to failure (crack/leak), as is the return line which goes down to the oil pan, so the essentials are in place. Hard to imagine not letting it "breath" from the 3rd, top-most hose would be an issue, but thats what i'm noodling....
  13. had a little time to do some reassembly on Greenie last weekend, after have her bits laid on shelves for last couple years. All good, except the top, forward frame vent hose (just behind good neck, no top, front of tank) I see is just capped with a bolt. PO removed the airbox and installed pods, which i'm leaving alone for now (for various reasons), so that hose that would terminate at the airbox is now plugged. Question is whether plugging it is ok. I got the bike that way from PO, but a lot of stuff wasn't right on the bike, and I'd think thats the case here. I'd think that would need to vent, so i'll look into best way to do that, but thoughts on that? Hose 16 on web sourced diagram from a spine frame of some sort...
  14. Touché… makes sense. My German is only just slightly better than “zero” so I’d not catch those details for words that aren’t related to food, hotel rooms, or beer. And for any that might wonder, that file photo shown, which several sites use of the nut makes it look like it’s used, but the real product does in fact look new.
  15. Lucky phil suggested checking with Stein Dinse, which is what I did. Found another source or two at similar prices. Looks like I paid 18 euros for the little bugger, but then a bunch more to ship it. mine, as shown in earlier pics in this thread, was in ugly shape. here’s a screen shot of my order. They use the term “screw fork”, which seems obscure. I think steering head nut was the term I used to find it from other sites. and as phil points out, it’s not chrome, it’s a stainless finish, which is different than stock but much preferred in my opinion.
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