Hot Fuel

UK PROFESSIONAL DRIVERS FORUMS THE UK PROFESSIONAL DRIVERS FORUM (INTERACTIVE)
21

Hi all

You only really notice the fuel temp on HPI engined Scanias as the fuel system on these engines return more fuel than they use, you will notice 4 large pipes in the tank pick up this is so the pump is not starved and the return is not resricted. This is no cause for concern and is totally normal. The sugesstion of it being a ■■■■■■■ is close as they use the same system.

22

You can’t really see the top of the tank on my motor as it is tucked right under the body. At least I’ve been concerned over nothing.

Although I’m due to go to Acton tomorrow so maybe the fuel will get very hot :unamused:

23

often get steam coming out the neck of the tank when filling up (■■■■■■■ signature motor)

24

Beattun, this is not steam, it is fuel vapour from the hot fuel in your tank and as the tank gets emptier the fuel will get hotter because there is less of it to absorb the heat. The injectors are known as open nozzle type, this means that a small amount of fuel at the end if the injector is in contact with the combustion and is then returned to tank, this combined with the high volume of fuel being pumped around the system gets the fuel quite hot…so no trouble with waxing in the winter on these

25

Hot diesel burns better too, making the engine more efficient.

Of course it won’t happen if you spend all day on the limiter - It’s most obvious when the engine is idling a lot as more fuel gets returned.

26

If its a red dot scania it is perfectly normal. They licenced the idea from ■■■■■■■ excess fuel is returned to the tank, regards kevmac47

27

Bagnall3150:
Hi all

You only really notice the fuel temp on HPI

Spot on. High pressure fuel injection heats the fuel up a hell of a lot more than a conventional system. Most have an air to fuel or coolant to fuel cooler built into the system to keep the fuel temp at a useable temp, as the hotter it gets the more inefficient it gets (the bigger the difference between combustion chamber/fuel temp the better efficiency wise).

28

Someone must have a photo of an old tyre burning under the tank :laughing:

One thing to do is to top off your tanks at the end of a shift to prevent condensation, it is still important on any engine but more so on a fuel return type