95 kw 3406b
engine has a mississippi red hot turbo, , i believe is what its called, also has ceramic exhaust manifold, was making 32 lbs of boost. Suddenly dropped down to 20. Put a fueI pressure guage on it, 40 at idle drops to 30 under boost with load and will drop down to 20 and stay a few seconds and then go back to 30. I will give a list of what all i have done to it.
cat filters
afrc diagprham
primer head,
all lines suction and return, I did find some chunks of rubber stuck in the tee for the return.
transfer pump
cac and 3 boots, cac had mutiple small leaks
none of this made any difference
I finally found 4 of the 6 intake gaskets pushed out, thought this would solve my issue. It did pickup 5 pounds of boost to 25 lbs.
When i go to Colorado it will make 27 lbs.
Tanks pull down even also.
also pyro never gets over 750
Anyone have any Ideas.
I have thought about fuel shutoff solenoid, but havent tried taking it off.
Thanks for any help!
3406b low boost and fuel pressure issues
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by rs72z, May 28, 2022.
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Dunno what fuel pressure's supposed to be but if it can't get fuel, it won't make boost.
Another Canadian driver, cke and Big Road Skateboard Thank this. -
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Another Canadian driver and Rubber duck kw Thank this.
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That's right where the fuel pressure runs on both of our B models. Without running a FAS type system, or custom building your own pump system like @wore out has don't think you're going to get much better. The 90 degree fitting to the return line on the back of the injection pump has a little tiny orifice in it that restricts flow and builds the pressure, but I can't see that getting bored out. If it gets plugged your pressure goes way up.
I'll defer to @wore out as I'm not well enough versed in how they work to help.Another Canadian driver and Roger McG Thank this. -
Im worried about the drops in pressure under boost when loaded.Another Canadian driver Thanks this.
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