fuel pump upgrade

[DeanR]

Anyone ever seen or heard of this fuel pump (upgrade) kit?

ebay Item number: 130239438692

[The Lorax]

Never heard of it, never heard of a motorcycle with vapor lock either. I had a car that used to vapor lock consistently, it was old, had a mechanical fuel pump and was a piece of crap. I guess if one really wanted an electric fuel pump, one could put it on, but is the pressure more than the needle valves can hold back? I know, that ad says it won't cause flooding, but who really knows. I certainly could be mistaken, wouldn't be the first or last time but it seems a little suspicious to me, a useless trinket if you will. just my humble opinion, someone, anyone feel free to correct me. have a nice day and ride safe

[Dennyz]

Snake oil!

[jeffe]

I've never had gravity fail yet.

[kjohnson]

I find that gravity flows more than enough some times and have never had a problem. I wonder how many would be fooled tho...

[TADracer]

This thing came up on the forum a week or two ago and was deemed probable BS then. I see no advantage to have a fuel pump on a gravity system unless you can burn so much fuel under WOT that gravity cannot keep up. Certainly has'nt happened to me yet.

[planedick]

Pump

The FJ1200 I'm working on has a fuel pump. Same carbs as the XS1100.

[81xsproject]

Snake oil, seconded.

[LoHo]

The test is simple:

A: Fill the tank, and run WOT as fast as you can. See how long it takes to empty the tank.

B: Fill the tank, set the petcocks on prime, and pull the fuel lines loose. See how long it takes to empty the tank.

Anyone wanna bet on "A"?

[DavesXS]

Originally posted by LoHo
The test is simple:

A: Fill the tank, and run WOT as fast as you can. See how long it takes to empty the tank.

B: Fill the tank, set the petcocks on prime, and pull the fuel lines loose. See how long it takes to empty the tank.

Anyone wanna bet on "A"?

Be sure to video that test for us.
I am wondering where your going to WOT non stop untill the entire take is gone

My bet is B

[81xsproject]

I would say the test would be more accurate if you set it to prime and opened the bowl drains.

You could maybe pull off the WOT test in UT or NV. We took a trip out the 50 a couple months back. Went 90 the whole way and never saw a cop.

[TADracer]

Originally posted by DavesXS


Be sure to video that test for us.
I am wondering where your going to WOT non stop untill the entire take is gone

My bet is B

I have to go with B also. The motor will not use fuel faster than it can drain from the tank. I did a test before installing my in-line filters. ONE cock drained 12 ounces in 15 seconds. Consider there are two on the tank and I am sorry, the motor just will not drink up 24 ounces of fuel in 15 seconds at WOT.

BTW, did the test with and without the filters (Russell 40 micron). They had no effect on the fuel flow at all.

[AlanB]

Hi Guys,

When I fitted modern carbs to my SG, I changed the cocks to match the 8mm hose on the carbs.

When I tested the fuel flow, it was notably quicker with the fuel cap open; the limit to fuel flow on my bike was the tank vent!

However, the fuel flowed FAR faster than it could ever be used!

AlanB

[egsols]

12 ounces in 15 secs is 22.5 gallons per hour.

Travelling at 60 miles per hour and getting 30 miles per gallon would be 2 gallons per hour.

That's less then a 10th of what the lines can supply based on TADracer's results.

So if the bike can use it as fast as it flows then 22.5 gallons per hour at say maybe 10 miles per gallon would be 225 miles per hour!

[LoHo]

Geez, guys, that was rhetorical..."Anyone wanna bet on 'A'?" But thanks for weighing in.

I see fuel starvation threads on here periodically, and a kinked hose or other obstruction can make that happen. But guys who think the gas tank doesn't empty fast enough are dreaming...

Nice figuring, Ernie. Personally, I have never been able to break through that 200mph barrier.