Fuel pump bypass

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Tom61
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Fuel pump bypass

#1

Post by Tom61 »

download/file.php?mode=view&id=77359
Cheap easy mod to prime the carbs after drain down or when your wing has been stood for a while. Just open the fuel cock open the valve wait a minute close the bypass valve then start her up. Ideal for early wings with mechanical fuel pumps.
Saves all that cranking.
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ericheath
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Re: Fuel pump bypass

#2

Post by ericheath »

anim-cheers1 anim-cheers1 Saves the starter
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
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Fred Camper
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Re: Fuel pump bypass

#3

Post by Fred Camper »

I like it. Thank you for posting. Will you be selling the kit? LOL.
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05c50
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Re: Fuel pump bypass

#4

Post by 05c50 »

If I remember correctly, Pistol Pete posted something like that a few years ago and he was selling them. I'm old so don't quote me on that.

......Paul
I prefer to ride my wing naked,thank you
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05c50
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Re: Fuel pump bypass

#5

Post by 05c50 »

Maybe it was Randall.

......Paul
Last edited by 05c50 on Fri Feb 14, 2020 5:49 pm, edited 1 time in total.
I prefer to ride my wing naked,thank you
My wife asked me "How many bikes does one man need?" My answer "Uhhh.just one more"
75 Goldwing
78 Goldwing
77 CB750a
77 CB550f
80 CB650c
05 Boule C50
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CYBORG
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Re: Fuel pump bypass

#6

Post by CYBORG »

I use an electric fuel pump..... does the same thing Less moving parts action1
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
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robin1731
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Re: Fuel pump bypass

#7

Post by robin1731 »

CYBORG wrote:I use an electric fuel pump..... does the same thing Less moving parts action1
And you don't have to remember to move a lever one way then the other. ;)
.
1975 GL1000 parts bike (parts for sale)
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
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Cakey
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Re: Fuel pump bypass

#8

Post by Cakey »

Great idea. Any pics of one set up on the bike? It’s one thing that annoys me as I religiously run the bowls dry now after getting sick of pulling the carbs off and cleaning when it sat to long and I had not run it dry.
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robin1731
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Re: Fuel pump bypass

#9

Post by robin1731 »

One thing to remember. The tank would need to be at least 1/2 full for this to work.

.
1975 GL1000 parts bike (parts for sale)
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
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Cakey
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Re: Fuel pump bypass

#10

Post by Cakey »

Good advice as always Robin.
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Tom61
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Re: Fuel pump bypass

#11

Post by Tom61 »

robin1731 wrote:One thing to remember. The tank would need to be at least 1/2 full for this to work.

.
I find as long as the gas cap hasn't been moved there is enough natural pressure in the tank to push the fuel through even when its quite low.
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robin1731
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Re: Fuel pump bypass

#12

Post by robin1731 »

Tom61 wrote:
robin1731 wrote:One thing to remember. The tank would need to be at least 1/2 full for this to work.

.
I find as long as the gas cap hasn't been moved there is enough natural pressure in the tank to push the fuel through even when its quite low.
Perhaps when outside temp is high. But in cooler weather the pressure will go down and won't be as successful at feeding the carbs which are then above the fuel level.

.
1975 GL1000 parts bike (parts for sale)
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
Explorer
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Re: Fuel pump bypass

#13

Post by Explorer »

I was thinking along those lines too, isn't the whole idea of the pump because in general there is no height, gravitational pressure difference, between the gas tank and the float bowl(s)?
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desertrefugee
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Re: Fuel pump bypass

#14

Post by desertrefugee »

Man, do I like this idea. However, like cyborg, my 1000 also employs an electric fuel pump but the vast majority of them don’t. This is a great idea.
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Re: Fuel pump bypass

#15

Post by Explorer »

desertrefugee wrote:Man, do I like this idea. However, like cyborg, my 1000 also employs an electric fuel pump but the vast majority of them don’t. This is a great idea.
i gotta admit, I'm not as totally convinced as you are.

So you've either got to put the bike up with a full tank of gas for long enough for the bowl(s) to go dry. Or go down the road, get gas and fill it up, just to save a few seconds of starter motor use? Hmmmm!
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