Several days ago I sent them a question asking them if it was the Performance Electric P06K that sells for around $30. Today I received a response
"No it is an HFP-360"
Here are both pumps side-by-side, the Hi-Flow is slightly longer and weighs twice as much, so not nearly the same. Note, tho, the one from Rock Auto has nuts on the terminal lugs, the Hi-Flow does not. Hmmmmm...
Anyhoo, if the Rock Auto works okay (it'll go in someday), it would be my choice as it probably flows LESS (good in our case at the lower fuel pressure required than a typical car) AND it costs 1/2 as much. That being said, tho, the Hi-Flow is obviously a more quality part, so...
Now, to yesterday's failure:
1. Bike ran really fine all the way to Peoria, AZ on Thursady. Everything operating. Remember specifically gas gauge still showed 1/2+ at 180 (my mid-tank estimate of "running right" on lipSTick.)
2. 7:30AM Friday, left DaveyB's house for the State Capitol. Notice the gas gauge reading
E. Wazzup'wi'dat?
3. About 3 miles in, ran out'a gas. Huh! Just over 180 miles on the tank, showed 1/2 full when I arrived on Thursday, now empty and out'a gas. No Way!
4. David towed me to the nearest gas. Filled up, took only 4+ gallons, about right. So, not out'a gas, just out'a FLOW!
5. Stripped the bike and looking for obvious problems. Voltages at the pump connection look right but no go on either OEM or Aux pumps. Gotta be something in a ground to have taken out the gas gauge too.
6. With a full tank, gravity has refilled the bowls. Decide to head back to David's.
7. 2 miles later, stuttering and bumping again, pull into a Circle K. System not keeping up under gravity.
8. Took my length of siphon hose and a plastic bag, stuck the hose in the filler hole, wrapped the plastic around to get some seal, and BLOW into the tank. Got enuff pressure to get'er running roughly and back to David's.
9. More trouble shooting and perusing Jhn Oo's color wiring diagrams on-line (thanks, John.) The diagrams show the gas gauge and pump circuits are completely separate. Hmmmm. Also, no blown fuses.
10. Pull the OEM pump, test shows it's running but almost no flow at all. Aux pump now running, also shows reduced flow tho.
11. Disassemble the pump. Stock pump appears to be running slow. The anti-siphon valve (inside the large black fitting terminal opposite end of the motor) seems to function but large flow restriction. Dirty?
Here's a couple more pics:
The pump assembly opposite the motor is where the hoses connect. The large 90 is where the "fuel input hose" attaches, the smaller is where the output hose connects. Looking down into the area where the motor goes, the black hole is where the opposite end of the output fitting, it has what I assume is an anti-siphon valve. This pic is of the original pump assembly and there is almost no restricition to air (my bad breath
) in either direction. The same check on STanley's pump is high restriction in BOTH directions, and you can hear a restrictor move as air is pushed/pulled thru it. Which is correct? Guess I'll have to pull STick's pump and test it.
12. Back to David's. The small hose on the pump assembly looked bad so replaced it with 5/16 fuel line from Pep Boys. No apparent leaks tho. Broke the end off the large hose but still long enuff to fit, so no problem there.
13. Found nearly zero flow thru the stock pump motor, tho it was running. Restrictor valve problem? Don't know yet.
14. Low but adequate flow thru the aux. pump. It draws thru that same restriciton, so... ?
15. Shorted across the leads for the gas gauge and it immediately jumped to full, so no problem with the gauge. Hooked the float bail and pulled up, again the gauge read full, so problem with the circuit in the tank. Either the bail is bent (unlikely as it returned to function for about 40 miles when I filled up yesterday evening in Wickenburg) or the variable rheostat in the tank is intermittent. Broken wire? Maybe.
16. On the ride home yesterday, I turned OFF the aux. pump as we pulled into Wickenburg. Figured, with the aux. ON, she runs ruff at low speed. If the floats are full, she should run on "reserve" for a couple miles without it. Stopped on the north side of town and refilled, left the aux pump OFF for the next 40 miles and she ran fine.
17. Once into some stiff hills, at 75 MPH, the stock pump couldn't keep up on the uphills. Flipped the aux. to ON, and she picked right up. Tells me the stock pump was trying but not passing enuff gas for the job. Aux made the diff to get me home.
There, we're up to date. Next job is to open up one of the "bad" pump motors and get a close look at the guts.
Open question: Is that an anti-siphon valve, or a restrictor, on the pump end of the small 90? fitting. And, how should it react to suck 'n blow?
More to come this afternoon.
OH, one more thing: on the fitting inside the tank at the pump opening: I stuck a hose on there and blew into it. No bubbles, just air coming out the other end, where ever that may be. So, at least on lipSTick's tank, that internal tube does NOT draw gas. I'll get a real pic later when I pull that tank and remove the gas gauge sender unit.
