Why is common rail diesel fuel system not at fault?
In summary, the common rail diesel fuel system was not at fault on this occasion. This was proved by the quick health check. The excessive diesel knock occurring for the first few minutes after a cold engine start was due to engine oil mist being inducted into the cylinders from a failed turbo seal on the compressor side.
What happens when fuel is spilled at high pressure?
Fuel not needed at high pressure is spilled back to the low pressure circuit. By closing the valve earlier or later, the amount of fuel compressed can be increased or decreased respectively. A poppet-type valve is not pressure balanced (i.e., it is pressure-biased) so that once closed, high pressure generated in the pump helps to seal the valve.
How is pressure controlled in a fuel injection system?
Another means is to vary the effective displacement of the high pressure pump. By carefully controlling the amount of fuel entering the pump and avoiding compression of excess fuel to high pressure, the fuel injection system hydraulic efficiency can be improved and generation of excessively high fuel temperatures can be avoided.
What to do if fuel pump timing is wrong?
If the low temperature preheating device is normal, check whether the injection timing is correct. Turn the engine and insert the engine camshaft timing pin, that is, when it is located at the upper dead center of cylinder compression, check whether the fuel pump camshaft lock pin can be inserted.
How to find a fuel problem on a boat?
The Westerbeke has an electric fuel pump on it, and if we did the bleed procedure — 30 to 60 seconds of pumping the fuel — it would start again and run well . . . for a while. Then the ups and downs would start again. Everyone we talked to and all the books we read agreed that the basic problem was fuel starvation.
Why do I have fuel starvation on my Boat?
Everyone we talked to and all the books we read agreed that the basic problem was fuel starvation. But why? It could be dirty fuel and a plugged filter, a problem in the fuel pickup tube in the tank, water in the fuel that was getting past the Racor, an air leak or even a kinked or collapsed fuel hose.
Why is there water in my fuel tank?
It could be dirty fuel and a plugged filter, a problem in the fuel pickup tube in the tank, water in the fuel that was getting past the Racor, an air leak or even a kinked or collapsed fuel hose. I’ll write in more detail about some of the things we did to test each of these, but do a quick recap here.
Why is there less fuel in the tank?
Since we’d had more problems as the trip had progressed and thus there was less fuel in the tank, we suspected maybe there was a crack in the tank pickup.
How does a fuel rail pressure test work?
This test takes just a few minutes using nothing more than the graphing function of a diagnostic scan tool to evaluate fuel rail pressure against engine speed. The purpose of the test is to establish what rail pressure the system is capable of producing during engine cranking, at engine idle speed and during a snap acceleration.
What happens when a bolt comes loose on a gas line?
If the bolt comes loose, this clamp force weakens. Loose bolts are not just an irritating nuisance. If the joint is not quickly retightened, the application may begin to leak fluid or gas, the bolt may break, equipment may become damaged, or catastrophic accidents may occur.
What are the symptoms of a diesel knock?
The symptoms were severe diesel knock when the engine was started from cold and greyish/white smoke from the exhaust. After a couple of minutes, the diesel knock subsided but the smoky exhaust continued.
Why is there no pressure on the fuel rail?
If the pressure at the exit side of the fuel filter is normal and yet the pressure on the fuel rail is essentially zero, it’s possible the fuel pressure regulator has failed wide open, essentially preventing sufficient pressure from building.
Why does my car not start at the rail?
I have no fuel preserver at the rail but got great fuel pressure at the fuel filter . This all started while I was driving and when I went to take off from the stop light the car just shut off and won’t start up it cranks but won’t fire up .
What to do when your fuel filter stops draining?
Once the o-ring seal is broken the siphon stops and you will only drain what is left in the housing. Of course the fuel cap idea is a good suggestion as well. You can also start to remove the filter housing. Once the o-ring seal is broken the siphon stops and you will only drain what is left in the housing.
Is there a way to stop a bulb from unscrewing?
On the other hand, the bulb can always move in the unscrewing direction. There’s nothing to stop it until it falls out. If the random forces are not perfectly balanced, they will tend to nudge the bulb more in one direction than the other.