Vapor lock on 2010 390??

MrSmooth said:

My bike never once died or even hesitated while running until I took my fuel pump out to inspect the filter and then reinstalled. After that, it started dying while riding and then progressively and quickly got worse to the point of not starting. That does sound like a loose connection. The hot starting (my original problem), doesn't sound like a loose connection to me but anything is possible I suppose.

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Good input and food for thought, sir. I am thinking about purchasing/installing a 70D sub-frame, fuel tank ... and when I do ... I plan on installing the micro-sock fuel filter ... and drilling/screwing the locating tangs for the fuel pump cover.

So I will now *definitely* be watching out for any loose or kinked wires! Or hoses for that matter...

Thanks! E-Ticket

:bounce3: :bounce3: :bounce3:

Finally got the bike fixed ***permanently***!! So happy that I don't have to worry about being stranded on the trail, or left wondering just how long it's going to take my bike to start back up! Riding was really turning into a chore, but now it's fun again!

jlew said:

:bounce3: :bounce3: :bounce3:

Finally got the bike fixed ***permanently***!! So happy that I don't have to worry about being stranded on the trail, or left wondering just how long it's going to take my bike to start back up! Riding was really turning into a chore, but now it's fun again!

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What fixed it?

MrSmooth said:

jlew said:

:bounce3: :bounce3: :bounce3:

Finally got the bike fixed ***permanently***!! So happy that I don't have to worry about being stranded on the trail, or left wondering just how long it's going to take my bike to start back up! Riding was really turning into a chore, but now it's fun again!

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What fixed it?

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Yeah man, that's cruel!!
My bike is still sitting at the dealer... What was it?!!!

Ok ok ok.

Here's how you do it. Take your Husaberg to the dealer, throw it in their dumpster where it belongs, and then buy the KTM of your choice. It's that easy!

jlew said:

Ok ok ok.

Here's how you do it. Take your Husaberg to the dealer, throw it in their dumpster where it belongs, and then buy the KTM of your choice. It's that easy!

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:eep: :crazy: :crazy: :crazy: :crazy:

Guess i'm the next one having the fuel pump issue,(cut out on me twice on my last ride) problem for me is the dealer is a 7 hour drive, so before I make the trip I plan to do my own trobleshooting.
First by installing a Tee and a small quick disconnect in the fuel line to check pressure when it dies, and also tap into the power wire of the pump to moniter voltage.
If I know sure that's the problem then the fight with dealer will begin, for me 500 dollars on a pump for a new bike is unacceptible, especially since I already spent to much on the bike in an attempt to make the bike trouble free.
Don't get me wrong this is the best bike i've owned to date (last 2 were KTM and several hondas before)

2010 FE570
fuel tank heat sheild
fiberglass wrap on header
radiator fan with adjustable temp switch
trail tech temp guage
moose radiator quards
turntech 7.5AH lithium battery
fork socks
HBD handguards

First I would check to see that all connections are tight. Including the one on the fuel pump. That means draining your tank while you're at it you can check the white circular filter on the fuel pump for goo. If it turns out to be your fuel pump, mine was replaced under warranty.

katoomed00 said:

Guess i'm the next one having the fuel pump issue,(cut out on me twice on my last ride) problem for me is the dealer is a 7 hour drive, so before I make the trip I plan to do my own trobleshooting.
First by installing a Tee and a small quick disconnect in the fuel line to check pressure when it dies, and also tap into the power wire of the pump to moniter voltage.
If I know sure that's the problem then the fight with dealer will begin, for me 500 dollars on a pump for a new bike is unacceptible, especially since I already spent to much on the bike in an attempt to make the bike trouble free.
Don't get me wrong this is the best bike i've owned to date (last 2 were KTM and several hondas before)

2010 FE570
fuel tank heat sheild
fiberglass wrap on header
radiator fan with adjustable temp switch
trail tech temp guage
moose radiator quards
turntech 7.5AH lithium battery
fork socks
HBD handguards

Click to expand...

When it "cuts out", does it fail to restart for 15 or so minutes? During that fail-to-start mode do you hear the fuel pump buzzing?

first time it took about 2 minutes to restart , the second time about 4 and I didn't hear the pump when the start button was pushed .

also I had read this thread before it happen to me and kinda knew what to look for

My 390 started acting up at 16 hours. It currently has 19 hours on it.
The problem was that the bike was killing and not starting after it had been ridden for a while. I don't want to use the word hot. Because the 390 doesn't boil, the fuel like my 570 does. Now we are riding on snow-covered mountains. The bike is running plenty cool.
The bike has died several times on the trail. We removed the spark plug and it was dry.
Yesterday I was out with a fellow rider. The bike pulled the no starting routine several times. The good news is that I think that I got a handle on the symptoms.

The bike is warmed up. Fuel is not boiling or anything. The bike dies. I try to restart it. It fires up and runs for a second and dies. No fuel. I know this for sure. I even tried to prime it. It runs until the primed fuel is use up then it dies.
So we let the bike sit form a half hour all the way up to an hour. Once it started it ran fine. I pulled the fuel line nothing. In fact I would lesson to see if the pump was running when I was trying to start it. The pump was not running.
I recently replaced the old fuel filter and screen. Both of the OEM units looked good.
So fuel filters are not the problem.
I have made plans to take the bike to Gunnison this week to get the fuel pressure checked. But when the bike runs it's perfect. So I think that it has something to do with the power to the pump.

Hair said:

The bike is warmed up. Fuel is not boiling or anything. The bike dies. I try to restart it. It fires up and runs for a second and dies. No fuel. I know this for sure. I even tried to prime it. It runs until the primed fuel is use up then it dies.
So we let the bike sit form a half hour all the way up to an hour. Once it started it ran fine. I pulled the fuel line nothing. In fact I would lesson to see if the pump was running when I was trying to start it. The pump was not running.
.

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Hair, just curious, how do you "prime" the fuel pump? Maybe this is something I can try for on my bike.

Also, when you disconnect the fuel line there are check valves on each end that activate to prevent fuel from leaking during the disconnect. Unless you disconnect it somewhere besides the quick connect fitting, you won't see much more than a small dribble from the fitting itself. Gas was not boiling at all this time.

I really think the fuel pump itself has built in thermal overload protection.

My bike shut down once again after I pulled off of the MX track, it wouldnt start. Again, the bike wasn't hot but I probably had 0.75 gallons in the tank.

Juicifer said:

Hair said:

The bike is warmed up. Fuel is not boiling or anything. The bike dies. I try to restart it. It fires up and runs for a second and dies. No fuel. I know this for sure. I even tried to prime it. It runs until the primed fuel is use up then it dies.
So we let the bike sit form a half hour all the way up to an hour. Once it started it ran fine. I pulled the fuel line nothing. In fact I would lesson to see if the pump was running when I was trying to start it. The pump was not running.
.

Click to expand...

Hair, just curious, how do you "prime" the fuel pump? Maybe this is something I can try for on my bike.

Also, when you disconnect the fuel line there are check valves on each end that activate to prevent fuel from leaking during the disconnect. Unless you disconnect it somewhere besides the quick connect fitting, you won't see much more than a small dribble from the fitting itself. Gas was not boiling at all this time.

I really think the fuel pump itself has built in thermal overload protection.

My bike shut down once again after I pulled off of the MX track, it wouldnt start. Again, the bike wasn't hot but I probably had 0.75 gallons in the tank.

Click to expand...

I'm planning on buying a second "Husaberg Wash Cap Set" ... so that I can cut the end out of the plug-in side ... so that I can insert it and see if the fuel pump is actually pumping fuel.

I don't have any issues at this time -- just thinkin' and plannin' for a "just in case."

E-Ticket

I think that you can place your ear next to it and figure that out. Once you hit the E-start you should hear the pump running.

I will talk to Kevin at Gunnison Motorsorts about it today. Kevin seems like he is on top of some of these issues. And I am planning on hauling my bike up to Fritz's shop on Friday. I am convinced that we will get this sweet little bike sorted.

Hair said:

I think that you can place your ear next to it and figure that out. Once you hit the E-start you should hear the pump running.

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I am half deaf and I can hear the pump spin up if I touch the start button for just a fraction of a second.

CodeMonkey said:

Hair said:

I think that you can place your ear next to it and figure that out. Once you hit the E-start you should hear the pump running.

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I am half deaf and I can hear the pump spin up if I touch the start button for just a fraction of a second.

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Yes and everytime my bike didn't start the pump was definately not spinning up.

MrSmooth said:

CodeMonkey said:

Hair said:

I think that you can place your ear next to it and figure that out. Once you hit the E-start you should hear the pump running.

Click to expand...

I am half deaf and I can hear the pump spin up if I touch the start button for just a fraction of a second.

Click to expand...

Yes and everytime my bike didn't start the pump was definately not spinning up.

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I think given that and some of the other results people have found, I would look first for a loose connection and second for whether the fuel pump has a thermal problem.

Installed a small digital volt meter and tied it into the fuel pump power supply ,(it serves a dual purpose, I can also monitor the charging system ). When I bump the start button the meter jumps up to 12 or so volts for a few seconds and I can also hear the pump. Next is to install a fuel pressure gauge, (hopefully this will take out some of the guessing) then go ride, (My luck after all the work ,the darn thing won't shut down, LOL)

Also I did remove the fuel pump from the tank and inspected the filter,screen and all the connections

My dealer called me. He said that Husaberg identified the problem. A batch of fuel pumps were made with too-tight internal tolerances. When the pump heats up, it gets tight due to thermal expansion. Since kinetic friction is less than static friction, as long as the pump is running, it will continue to run. However, when the pump is shut off, it doesn’t have enough torque to overcome the static friction so the pump won’t spin. After the pump cools down, it will loosen up enough to the pump’s torque to overcome the static friction, and it will spin again.

When the cool pump is bench tested, it will pass all pressure and ohm tests and appear to be fine. The problem is due to internal mechanical binding. This makes perfect sense. Unfortunately, I do not know if KTM isolated the problem to a particular batch of pumps or to a certain range of bike VINs.

Thanks JQ that does make perfect sense and was exactly the scenaro I was having.