MGP wrote:It could be to stop chaffing or possibly to help protect from touching anything hot but I would be more inclined to think that it is there because in the event of a pinhole developing in a hose, with a fuel pressure of over 3 bar you would end up with a very fine mist of fuel filling the engine bay, at least with the conduit over the hoses the fine mist would be contained.
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this pic of a DJ engine bay shows a pipe unsleeved which implies pin hole spray is not the reason
That pipe could well have been replaced, looks like there is a jubilee clip on there, I doubt it left vw like that, but then again I don't know everything, it seems strange that the pipe running across the crankcase doesn't have it?
Protective plastic cover goes over your 7mm fuel line hose to prevent puncture. Priced per meter.
Volkswagen recommended this in the engine compartment area to protect against abrasion of the fuel line. You can cut it to size and put a section anywhere that it may rub against something.
Having looked at that picture properly, that hose is the return to the tank from the pressure regulator, so it's the only hose in the engine bay that is low pressure, also explains the jubilee clip rather than the proper crimped hose clamp.
I can't get my head around not using the sleeving on that hose though, then again I have never liked the amount on hose used on the EFI flat 4's
Re the fuel saver thing , was it a gizmo designed to increase the octane level of the fuel by some wizardry type spell ? Other thing I've seen like that contained lead pellets to add lead to lead free fuel back in the 90,s.
The PROZONE FUELSAVER is a combustion optimiser.Its function is based on the simple principle of preparing fuel for better combustion.This process, invented in the late 30s, consists in chemically modifying the fuel to allow even the use of poor quality fuel.PROZONE FUELSAVER device is cylindrical in shape and made of aluminium alloy. The fuel passes through this cylinder and into turbulence caused by conical chicanes placed carefully inside the tube.Through rubbing, micro-particles of 3 different metals are added to the fuel. It’s the engine’s fuel suction that determines the exact dosage of these micro-particles.The enhanced fuel then passes through a sintered ceramic magnetic field which alters the free electron structure of the fuel and encourages better bonding between fuel molecules and oxygen molecules at the time of combustion.During the combustion process in the combustion chambers, the molecules of tin coat the vulnerable surfaces of the valves and provide enhanced engine lubrication.The other components of the amalgam increase the octane and cetin levels of the fuel optimising the combustion process and reducing the production of carbon monoxide and nitric oxides. This is because more of the residues have been burnt up.Fuel that is better burnt is better utilised and therefore leads to greater savings, a reduction in air pollution and better engine performance.
slowcoach wrote: Can be a nightmare to thread the fuel hose through them when they're old and pinched though
You are right there, particularly hard with new Brickwerks hose which is slightly larger diameter, I put them in hot water and manipulated them over a straight piece of old pipe to get them round which did the trick.
