I have no problem filling my tank up the neck and I have not spiked it. What is the purpose of spiking when we have a fuel vent tube? I'll have to watch closer on my next fill. maybe I'm missing something.
I found a really cool elevation map
You know, you make a good point.
For me, once the fuel hit the bottom of the filler neck the neck would fill up quickly, then it would sink down into the tank, and then fill up again, down into the tank, and so on SEVERAL TIMES until I'd finally give up on it LOL. Apparently it just doesn't vent quick enough and maybe the long rubber vent tube under the tank has a sharp bend or kink in it. I have to pull the tank off again when my new cables get in so I'll check a little better next time I pull it off.
So here's what happened today with the new holes. I was down about a gallon so before heading out on this trip so I started filling it. Instead of stopping and then filling only the neck when it hit the bottom of the filler neck, it just kept rising. I was suspicious so I stopped to see if it was going to go back down into the tank, AND IT DIDN'T. It was continuing to fill as it probably should have been doing all along.
So I tried to take it up to the holes and that hose was running so fast that it overflowed the tank a bit. I couldn't get that nozzle to trickle. So I stopped at about 1/4" below the holes and went for a ride.
THIS SAVED SO MUCH TIME AT THE PUMP!! It was super fast compared to before.
We planned a 127 mile afternoon loop which took us through the town of Nipton, CA, elevation 3000', which was just in the news because someone bought the entire town to turn it into a marijuana empire (about 50 miles south of Las Vegas).
We ran south down I-15 into an irritating headwind, riding 2-up, at about 80 MPH. Hit the Nipton turnoff 44 miles down the freeway and putted east at about 60 to Nipton. Took some pics, hydrated (temps were about 100*), and continued east back into Nevada, crossing a mountain pass at 4900' elevation.
Hit the remote Nevada desert town of Searchlight, elevation 3500' (former Senator Harry Reid's hometown, LOL) and opted to take a side leg further east down to an isolated Lake Mohave Cottonwood Cove Marina, elevation 650', where we'd never been. That was about a 30 mile leg down and back, way downhill to the river and straight back up to the highway, a 2850' elevation change each way.
Headed north back toward Boulder City, east of Vegas, averaging around 90 MPH for 35 miles while trailing a BMW up a desolate back highway as the sun set over the mountains. Hit the freeway west and ran freeway speeds the rest of the 20 mile ride home, elevation 2250'.
Filled up after getting home, this time at a Chevron station with a slower running gas pump. Odometer read 164 miles at that point. Filled back to the same level and put in just under 3.5 gallons. Mileage came in at 47 MPG for this run, not bad for 2-up at speed, changing elevations, and into the wind. And the fuel gauge still read above 1/4 tank when I gassed up.
Next I'll see how low I can run the tank to see how much fuel I can actually squeeze into it overall.
Once again, it is SO MUCH FASTER to try to get to the top of the filler neck now and frankly I've never taken the needed time to get it up to the levels I ran today. Now it's just like filling a car or anything else; no waiting.
Didn't detect any overflow or leakage issues as a result of the extended fill. But splashing on the tank is clearly something I have to deal with now when trying to really top it off.