What is a diesel return for?

On most engines fuel is returned to the tank using the excess pressure in the injectors. If the return line goes to a tank above the injectors there will always be some fuel pressure on the injectors and depending on the exact design they May bleed fuel into the cylinders causing severe engine damage.

What are the difference between diesel and gasoline engine when it comes to fuel delivery?

Both diesel engines and gasoline engines convert fuel into energy through a series of small explosions — or combustions. In a gasoline engine, fuel is mixed with air, compressed by pistons and ignited by sparks from spark plugs. In a diesel engine, however, the air is compressed first, and then the fuel is injected.

Why do diesel engines have a return fuel line?

Diesel has a return line because the fuel is injected via the Injectors. In a very dynamic and transient conditions, the load or need for fuel varies very radically. in that case the Diesel Injector may have extra quantity at a very high pressure due to the previous demand.

Does fuel need return line?

When using a Return Style Fuel Pressure Regulator, it must be able to return 100\% of the fuel back to the tank. The Fuel Return Line should be at least the same size, or one size larger than the supply. The return line should direct fuel close to the bottom of the tank and away from the pickup.

Do diesels have fuel return lines?

What is a return line?

Return line means that portion of the recirculating system piping which carries clean water from the filter back to the swimming pool.

Does a fuel return line have pressure?

There is NO WAY there is that much pressure in a return line unless there is a problem with the line (blockage, kink, etc). If the tank was full of water, it would cause 0.25 PSI of pressure in the fuel line if it had 7″ of fuel above the return.

Which fuel line is the return line?

The vapour-return line normally runs from the fuel pump or the fuel filter to the fuel tank. This vapour-return line is connected to a special outlet in the fuel pump. Any vapour that forms in the fuel pump returns to the fuel tank through this line.

Why does a diesel engine have a return line?

Diesel has a return line because the fuel is injected via the Injectors. In a very dynamic and transient conditions, the load or need for fuel varies very radically. in that case the Diesel Injector may have extra quantity at a very high pressure due to the previous demand.

Do petrol cars have a return line?

Petrol-injected cars do have a return line. Even some carbureted cars have them to prevent vapour-lock (fuel boiling) in the fuel lines by circulating the fuel back to the fuel tank to cool down. All fuel injected engines (which means all diesels and all modern petrol engines) have a return line.

What happens if you run a diesel engine on gasoline?

But the problem with gasoline in a diesel engine is that diesel engines rely on diesel to lubricate various components (diesel is an oil). If you put petrol through these components, it washes away all the lubrication and will cause them to overheat, seize up and fail. As an aside, you can also run a diesel engine on cooking oil or parafin.

Why does a diesel engine have a high fuel pressure?

Because fuel is injected when the compression is very high, very high fuel pressure is required (it also helps atomization). A modern diesel engine like the Chevy Duramax has a fuel pressure of 23,000 PSI in the fuel rail. The closes comparison is a direct injected gasoline engine.