Technical Topics No.1

What is the Difference Between the Different Types of Fuel Hose?

Fuel, emissions and vacuum hoses are made of special materials to handle the liquid and vapours they carry. Fuel hose, for example, is made to withstand petrol and alcohol (up to a certain percentage concentration). It is also reinforced to withstand internal pressure.

It is also extremely important to use hose with the correct pressure rating for the application. Hose for electronic fuel injection (EFI) must have a higher pressure rating (35 to 70 psi or higher) than that approved for carburetted engines (7 to 10 psi).

You can always use a higher rated EFI hose on a carburetted application, but never the reverse. If lower pressure carburettor fuel hose is used on a high pressure EFI engine it may burst and could cause a fire.

High pressure EFI hoses often require special high pressure "rolled edge" clamps rather than standard clamps or spring clamps. Some EFI hoses also use special connectors.

This series of technical articles is of a general nature. The views expressed are not necessarily related to the Jackaroo, or any other make or model of vehicle. The content is believed to be accurate, but no responsibility can be accepted for errors or inaccuracies. If you have a problem with your vehicle you should consult a competent mechanic.