A fire washer, also known as an injector seal, is usually fitted to a diesel injector. The fire washer is responsible for keeping diesel vapor from escaping the combustion chamber.
It tells the injector to fire at correct time
It is likely an injector problem which would require you to replace the injectors.
I undo the diesel filter and fill with diesel to the top, and refit, Then slacken off the fuel injector supply pipes on the injector end, Crank over engine until fuel appears to leak down injector connection, tighten injector fuel connections and then continue to crank over engine. Should then start to fire up. Keep cranking till engine running on its own.
The fuel injector provides the fuel. The spark plug provides the fire.
A malfunctioning fuel injector pump will cause the injectors to not fire properly. The fuel injector pump will need to be replaced.
loosen fuel line at injector or delivery rail and crank engine until it begins to fire, then shut off, tighten injector or fuel rail connection, start it up and be on your way Some diesel engines are self-priming--some, you have to open a bleeder valve. It is best to check the owner's manual before bleeding a diesel because of the dangerous pressure that may be present.
If you mean the fuel injector for the #4 cylinder isn't working the answer is simple, either the injector is bad and needs replaced, or the connector has gone bad/ the wires are shorted out. Put an injector pulse tester on that injector (most people don't have these so you'll need to get it tested at a garage), if the injector doesn't fire when it's tested separatly you need an injector. If it does fire that means the plug/wire is the problem.
It will not run with diesel.
Petrol will catch fire first, petrol is highly flammable, diesel is not.
First do you have spark at the end of the plug wire for the spark plug to fire. If yes, do you have fuel from the injector. If you have spark, then most likely no fuel. Check the wire feed to the injector. Or, could be possibly a blocked injector.
Apply water to gasoline or diesel fire
As low as 126 degrees Fahrenheit, diesel fuel could potentially catch on fire. This is known as the temperature of ignition.