FXR Fuel System
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Joined: Mar 2019
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From: Southern CA
FXR Fuel System
Hello Everyone,
Subject: 1984 FXR, 1340 minus VOES. Unknown mileage. In need of a new top-end.
Is fuel delivery dependent upon engine vacuum?
The bike was running great, I parked it over the weekend and now it stalls like it's out of gas. Fuel tank has 1/4 tank.
If my top-end is completely shot, does a lack of vacuum hinder proper fuel delivery?
Thanks in advance.
Larry
Subject: 1984 FXR, 1340 minus VOES. Unknown mileage. In need of a new top-end.
Is fuel delivery dependent upon engine vacuum?
The bike was running great, I parked it over the weekend and now it stalls like it's out of gas. Fuel tank has 1/4 tank.
If my top-end is completely shot, does a lack of vacuum hinder proper fuel delivery?
Thanks in advance.
Larry
Grand HDF Member
Joined: Apr 2007
Posts: 3,725
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From: Brighton, MI
No, should be just a gravity feed from petcock to carb.
My first thought would be to fill the tank and try again, Second thought is look at clogged screen inside the tank especially on an older tank. . Could be a number of things: debris from fuel line breaking down from the inside of the fuel line, malfunctioning or obstructed petcock, or a sticky carb float.
My first thought would be to fill the tank and try again, Second thought is look at clogged screen inside the tank especially on an older tank. . Could be a number of things: debris from fuel line breaking down from the inside of the fuel line, malfunctioning or obstructed petcock, or a sticky carb float.
Seasoned HDF Member
Joined: Apr 2010
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From: Long Island, New York
New petcock, the reserve location may have changed. Put another gallon of fuel in the tank and see if that makes the problem go away, maybe it is an easy fix!?!?!? Maybe.
Grand HDF Member
Joined: Aug 2008
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From: Florida's gorgeous East coast
That shut me down ONE time..many years ago.
If you're hearing a "whooosh" sound when you remove the gas cap....your not venting properly.
If you're hearing a "whooosh" sound when you remove the gas cap....your not venting properly.
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From: Southern CA
UPDATE:
When I got home from work yesterday, I went to the bike to try to start it to see what happens.
The bike started right up and continued to run. I hadn't touched or done anything to it.
I let it run for a while, it ran just fine.
This morning I started it up as usual and rode all the way to work....no problems.
It was probably just a piece of grit making the float stick....i guess.
Thanks for all the input guys.
L
When I got home from work yesterday, I went to the bike to try to start it to see what happens.
The bike started right up and continued to run. I hadn't touched or done anything to it.
I let it run for a while, it ran just fine.
This morning I started it up as usual and rode all the way to work....no problems.
It was probably just a piece of grit making the float stick....i guess.
Thanks for all the input guys.
L
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Joined: Dec 2005
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From: NC USA
Three things,
(1) If the cap was not venting (and assuming you didn't open it) it may have sit long enough to finally leak enough air in to let the fuel flow.
(2) If there is tank lining or similar floating around in the tank, it may have been blocking the petcock screen and finally turned loose and fallen away from the screen.
(3) If the petcock screen is in place, it won't let anything by large enough to hold the float needle open or closed. Deteriorating fuel line will put trash in there though.
Draining the tank, pulling the petcock to check the screen and interior for big flakes floating around, plus replacing the fuel line are both easy and inexpensive jobs for piece of mind.
Glad it's running for you but don't put off some simple steps that could leave you sitting somewhere you don't want to be.
(1) If the cap was not venting (and assuming you didn't open it) it may have sit long enough to finally leak enough air in to let the fuel flow.
(2) If there is tank lining or similar floating around in the tank, it may have been blocking the petcock screen and finally turned loose and fallen away from the screen.
(3) If the petcock screen is in place, it won't let anything by large enough to hold the float needle open or closed. Deteriorating fuel line will put trash in there though.
Draining the tank, pulling the petcock to check the screen and interior for big flakes floating around, plus replacing the fuel line are both easy and inexpensive jobs for piece of mind.
Glad it's running for you but don't put off some simple steps that could leave you sitting somewhere you don't want to be.
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Joined: Mar 2019
Posts: 96
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From: Southern CA
Three things,
(1) If the cap was not venting (and assuming you didn't open it) it may have sit long enough to finally leak enough air in to let the fuel flow.
(2) If there is tank lining or similar floating around in the tank, it may have been blocking the petcock screen and finally turned loose and fallen away from the screen.
(3) If the petcock screen is in place, it won't let anything by large enough to hold the float needle open or closed. Deteriorating fuel line will put trash in there though.
Draining the tank, pulling the petcock to check the screen and interior for big flakes floating around, plus replacing the fuel line are both easy and inexpensive jobs for piece of mind.
Glad it's running for you but don't put off some simple steps that could leave you sitting somewhere you don't want to be.
(1) If the cap was not venting (and assuming you didn't open it) it may have sit long enough to finally leak enough air in to let the fuel flow.
(2) If there is tank lining or similar floating around in the tank, it may have been blocking the petcock screen and finally turned loose and fallen away from the screen.
(3) If the petcock screen is in place, it won't let anything by large enough to hold the float needle open or closed. Deteriorating fuel line will put trash in there though.
Draining the tank, pulling the petcock to check the screen and interior for big flakes floating around, plus replacing the fuel line are both easy and inexpensive jobs for piece of mind.
Glad it's running for you but don't put off some simple steps that could leave you sitting somewhere you don't want to be.
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