OM606.962 Valve Float @ raised boost?
OM606.962 Valve Float @ raised boost?
Sorry this is long but I need to explain my reasoning and I'd love your input.
On the fuel system, before winter I removed the pre-filter, replaced all the clear lines and O-rings and added the check valve. I had no bubbles in my fuel stream whatsoever.
On 2 different, REALLY REALLY cold days, my truck left me stranded and the problem was the pump was not getting fuel. The tank had plenty of diesel and the diesel wasn't gelled because I could suck some out from the tank fill and it was fine. I immediately suspected the check valve except that didn't make sense because the truck started fine in the morning after sitting outside all night during the coldest times of night, and ran fine in the morning for about 25 minutes. It was only after driving for about 20 minutes that I started to loose power and eventually, the engine died. When it died, you could NOT suck fuel through the line with either a primer bulb- or full vacuum from a pump... the fuel line appeared completely blocked! I actually put a heat gun on the check valve, which is under the truck in the fuel line right below the drivers seat. Even with heat gun on the valve the valve too hot to touch, the fuel would NOT flow.
I put the truck in a warm garage for the night, and the next morning, fuel flowed fine as if nothing was ever wrong EXCEPT- now I had bubbles in my fuel line going to the suction pump. The bubbles were being pumped into the filter but the line coming out of the filter to the IP had no bubbles.
I reasoned that the most likely cause of my problem was water in my fuel tank that froze and got sucked into the pick-up tube causing a blockage since my pickup is just rubber tube with no strainer screen. Once it melted, the blockage was gone. This stalling problem only ever occurred during temperatures well below freezing- but the truck drives fine all other times. Only - now my lines have bubbles in them. I reasoned that perhaps my heating the check valve and trying to suck fuel with full vacuum, I may have introduce a leak somewhere in the line... which I planned to address this weekend. I plan to:
1) Pulling the tank and redoing the fuel pick-up and return line. On the pick-up, I'm making it 8mm ID (steel line) with a mesh mushroom style screen on the end so if there's any ice in the tank, it can't be sucked tight into the tube and create an obstruction.
2) I'm extending the return line down to the bottom of the tank - below the fuel level so no air can get into the return line.
3) I'm running 8m ID solid lines from the tank to engine bay.
4) I'm getting rid of the check valve.
I hope this solves, my freezing temperature fuel starvation problem, air bubbles in my fuel supply and with no check valve, less restriction but no fuel drain back over night.
I'll see if this fixes my valve float issue but I suspect it wont.
I think my valve float issue is exhaust pack pressure related from the turbo. I recently purchased a bigger VNT turbo but it will be a while before I can install it. My thought is that while the existing gt2056 is great and spools instantly, the exhaust side is too restrictive with full fueling and high revs on the 606. I now have a GT2359 to test and I'll be able to see what the exhaust back pressure difference is and if that cures the valve float.
It's funny you should bring this up because over the winter, I have had problems with my fuel system. I don't "think" that is the cause of my valve float because I was having that problem before winter and it "seems" exhaust back pressure related.... but, it's an interesting idea! BTW- the sound at the end of 1st gear in your video is similar to mine except that mine is about 100 times worse and aslo has a large smoke component!
Sorry this is long but I need to explain my reasoning and I'd love your input.
On the fuel system, before winter I removed the pre-filter, replaced all the clear lines and O-rings and added the check valve. I had no bubbles in my fuel stream whatsoever.
On 2 different, REALLY REALLY cold days, my truck left me stranded and the problem was the pump was not getting fuel. The tank had plenty of diesel and the diesel wasn't gelled because I could suck some out from the tank fill and it was fine. I immediately suspected the check valve except that didn't make sense because the truck started fine in the morning after sitting outside all night during the coldest times of night, and ran fine in the morning for about 25 minutes. It was only after driving for about 20 minutes that I started to loose power and eventually, the engine died. When it died, you could NOT suck fuel through the line with either a primer bulb- or full vacuum from a pump... the fuel line appeared completely blocked! I actually put a heat gun on the check valve, which is under the truck in the fuel line right below the drivers seat. Even with heat gun on the valve the valve too hot to touch, the fuel would NOT flow.
I put the truck in a warm garage for the night, and the next morning, fuel flowed fine as if nothing was ever wrong EXCEPT- now I had bubbles in my fuel line going to the suction pump. The bubbles were being pumped into the filter but the line coming out of the filter to the IP had no bubbles.
I reasoned that the most likely cause of my problem was water in my fuel tank that froze and got sucked into the pick-up tube causing a blockage since my pickup is just rubber tube with no strainer screen. Once it melted, the blockage was gone. This stalling problem only ever occurred during temperatures well below freezing- but the truck drives fine all other times. Only - now my lines have bubbles in them. I reasoned that perhaps my heating the check valve and trying to suck fuel with full vacuum, I may have introduce a leak somewhere in the line... which I planned to address this weekend. I plan to:
1) Pulling the tank and redoing the fuel pick-up and return line. On the pick-up, I'm making it 8mm ID (steel line) with a mesh mushroom style screen on the end so if there's any ice in the tank, it can't be sucked tight into the tube and create an obstruction.
2) I'm extending the return line down to the bottom of the tank - below the fuel level so no air can get into the return line.
3) I'm running 8m ID solid lines from the tank to engine bay.
4) I'm getting rid of the check valve.
I hope this solves, my freezing temperature fuel starvation problem, air bubbles in my fuel supply and with no check valve, less restriction but no fuel drain back over night.
I'll see if this fixes my valve float issue but I suspect it wont.
I think my valve float issue is exhaust pack pressure related from the turbo. I recently purchased a bigger VNT turbo but it will be a while before I can install it. My thought is that while the existing gt2056 is great and spools instantly, the exhaust side is too restrictive with full fueling and high revs on the 606. I now have a GT2359 to test and I'll be able to see what the exhaust back pressure difference is and if that cures the valve float.
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