Fuel Pump stopped, then started again
Thread Starter
|
Junior Member
Joined: Jun 2010
Posts: 15
Likes: 0
From: Lakeville, MN
Fuel Pump stopped, then started again
Long version:
Alright so I've done quite a bit of searching and reading up on the fuel pump but here's what happened to me today.
This morning I went out and started my bike, fired right up with the choke as always. I let it sit for a min with the choke while I geared up. Then I lowered the choke a bit so it idled normal (like 1500 rpms). When I gave it some throttle it died. So I started it again, choked it so it was running at like 4k rpms and gave it throttle and it slowly bogged it down till I ended up killing it again. I had to get going so I just took my car to work....
So after work today....I got home pulled off the fairings and checked the fuel pump. I noticed it wasn't "beating" at all, dead as could be. So I bypassed it and sure enough fired up, revved the engine with the throttle and took it around the block. I got back let it idle for a bit and felt the fuel pump, it still wasn't "beating". so I let the bike idle while I grabbed the fairings to put back on and before I did I felt the pump and sure enough it was beating like it should. I hooked it back up and it still worked, took it for like a 30 min ride around my house and it worked just fine, i reached down to feel it periodically while riding and could feel it beating. So my question is, could a fuel pump stop pumping for a time then kick back on?
Short version: Can a fuel pump stop pumping for a time then kick back on?
One thing to add while my bike was idling and I was bypassing the pump and such the pump was extremely hot to hold when I was taking the hoses off, like almost too hot to keep a hold of for more then a couple seconds. Is it suposed to get that hot?
Alright so I've done quite a bit of searching and reading up on the fuel pump but here's what happened to me today.
This morning I went out and started my bike, fired right up with the choke as always. I let it sit for a min with the choke while I geared up. Then I lowered the choke a bit so it idled normal (like 1500 rpms). When I gave it some throttle it died. So I started it again, choked it so it was running at like 4k rpms and gave it throttle and it slowly bogged it down till I ended up killing it again. I had to get going so I just took my car to work....
So after work today....I got home pulled off the fairings and checked the fuel pump. I noticed it wasn't "beating" at all, dead as could be. So I bypassed it and sure enough fired up, revved the engine with the throttle and took it around the block. I got back let it idle for a bit and felt the fuel pump, it still wasn't "beating". so I let the bike idle while I grabbed the fairings to put back on and before I did I felt the pump and sure enough it was beating like it should. I hooked it back up and it still worked, took it for like a 30 min ride around my house and it worked just fine, i reached down to feel it periodically while riding and could feel it beating. So my question is, could a fuel pump stop pumping for a time then kick back on?
Short version: Can a fuel pump stop pumping for a time then kick back on?
One thing to add while my bike was idling and I was bypassing the pump and such the pump was extremely hot to hold when I was taking the hoses off, like almost too hot to keep a hold of for more then a couple seconds. Is it suposed to get that hot?
Last edited by AmericanOne; Aug 11, 2010 at 11:03 PM.
Senior Member
Joined: Jul 2007
Posts: 897
Likes: 1
From: Atlanta
The fuel pump only "beats" when it's dry.Then,how much it "beats" is depending on how dry it is.So that's what you are experiencing.
These pumps only produce 3-4 psi,just enough the keep the float bowls from getting dry.Fuel pump will NOT affect how/whether or not the bike will idle/start.That problem is elsewhere.
Don't overthink this,these bikes are simple.
These pumps only produce 3-4 psi,just enough the keep the float bowls from getting dry.Fuel pump will NOT affect how/whether or not the bike will idle/start.That problem is elsewhere.
Don't overthink this,these bikes are simple.
Member
Joined: Aug 2010
Posts: 30
Likes: 0
The fuel pump only "beats" when it's dry.Then,how much it "beats" is depending on how dry it is.So that's what you are experiencing.
These pumps only produce 3-4 psi,just enough the keep the float bowls from getting dry.Fuel pump will NOT affect how/whether or not the bike will idle/start.That problem is elsewhere.
Don't overthink this,these bikes are simple.
These pumps only produce 3-4 psi,just enough the keep the float bowls from getting dry.Fuel pump will NOT affect how/whether or not the bike will idle/start.That problem is elsewhere.
Don't overthink this,these bikes are simple.
Not completely true, The pump can quit and restrict the flow of gas causing the carbs to not get fuel. That is what happened to me. My bike died on me, then started back up about 5 minutes later when the pump started to work again, then died on me again permanantly the third time. Sounds like your bike is doing the same thing. My pump was very hot too when it went bad it hurt to hold. Another way to check for sure is pull the cap off the top of the fuel pump and see if there is a blue spark and if the contact is moving up and down. Remember though the fuel pump will only run when the bike is running, NOT when you are just cranking it. How many miles are on the bike?
Thread Starter
|
Junior Member
Joined: Jun 2010
Posts: 15
Likes: 0
From: Lakeville, MN
Not completely true, The pump can quit and restrict the flow of gas causing the carbs to not get fuel. That is what happened to me. My bike died on me, then started back up about 5 minutes later when the pump started to work again, then died on me again permanantly the third time. Sounds like your bike is doing the same thing. My pump was very hot too when it went bad it hurt to hold. Another way to check for sure is pull the cap off the top of the fuel pump and see if there is a blue spark and if the contact is moving up and down. Remember though the fuel pump will only run when the bike is running, NOT when you are just cranking it. How many miles are on the bike?
You can run your bike without a fuel pump right? I mean I did bypass it and go around the block but it is ok to run without one on the freeway and higher RPM's? Just asking incase it goes out on me while I'm out and about.
Junior Member
Joined: Aug 2010
Posts: 1
Likes: 0
Like 96@cbr said, the pump can go bad, and IDoDirt's explanation of how to check/fix the pump is excellent:
https://cbrforum.com/forum/stickies-91/how-repair-your-f3-fuel-pump-102151/
I just wish I'd get around to plumbing mine back in. To answer your last question, you can definitely run your bike without the pump - last time mine decided to die on me while I was on the freeway, I pulled it out and replaced it with a piece of tubing bent in to a "U." Hasn't let me down in 5,000 miles. Granted, since the carbs are now gravity fed, the gas at the bottom of the tank doesn't come so easy - just gotta turn to reserve a little sooner on the odometer.
https://cbrforum.com/forum/stickies-91/how-repair-your-f3-fuel-pump-102151/
I just wish I'd get around to plumbing mine back in. To answer your last question, you can definitely run your bike without the pump - last time mine decided to die on me while I was on the freeway, I pulled it out and replaced it with a piece of tubing bent in to a "U." Hasn't let me down in 5,000 miles. Granted, since the carbs are now gravity fed, the gas at the bottom of the tank doesn't come so easy - just gotta turn to reserve a little sooner on the odometer.
Senior Member
Joined: Jul 2007
Posts: 897
Likes: 1
From: Atlanta
Pull the trigger=open the throttle
"Not completely true, The pump can quit and restrict the flow of gas causing the carbs to not get fuel. That is what happened to me. My bike died on me, then started back up about 5 minutes later when the pump started to work again, then died on me again permanantly the third time. Sounds like your bike is doing the same thing. My pump was very hot too when it went bad it hurt to hold. Another way to check for sure is pull the cap off the top of the fuel pump and see if there is a blue spark and if the contact is moving up and down. Remember though the fuel pump will only run when the bike is running, NOT when you are just cranking it. How many miles are on the bike? "
Incorrect.
The pump is on whenever you turn the electrical power on.What you stated above is not a fuel pump problem.This problem also lies elsewhere.Fuel pump doesn't "work sometimes and other times not".Either it does or doesn't.
The "driver" for the fuel pump is an electrical contact,similar to old-school ignition points.This is the part that goes bad,when the "points" wear out,or becomes heavily corroded.
"Not completely true, The pump can quit and restrict the flow of gas causing the carbs to not get fuel. That is what happened to me. My bike died on me, then started back up about 5 minutes later when the pump started to work again, then died on me again permanantly the third time. Sounds like your bike is doing the same thing. My pump was very hot too when it went bad it hurt to hold. Another way to check for sure is pull the cap off the top of the fuel pump and see if there is a blue spark and if the contact is moving up and down. Remember though the fuel pump will only run when the bike is running, NOT when you are just cranking it. How many miles are on the bike? "
Incorrect.
The pump is on whenever you turn the electrical power on.What you stated above is not a fuel pump problem.This problem also lies elsewhere.Fuel pump doesn't "work sometimes and other times not".Either it does or doesn't.
The "driver" for the fuel pump is an electrical contact,similar to old-school ignition points.This is the part that goes bad,when the "points" wear out,or becomes heavily corroded.