Does anyone know why there's a small black tube in the hose by the fuel filter ? Does it need to be there ?

 

Regards

I'm not sure which one you mean but I'd imagine it stops the hose kinking thus shutting off fuel to the engine.

I don't know what it does but Nissan go to the trouble of providing it, so it must serve a purpose. I can't think of a reason as to why it might work as a restrictor, so I wouldn't have thought that removing it would improve flowrate etc. I remember JeffTT posting somethig about it in the past, with reference to the tube either being fitted incorrectly or not at all - check his old posts.

The tube is in the filter, not the hose IIRC.

 

Originally posted by smw1

I'm not sure which one you mean but I'd imagine it stops the hose kinking thus shutting off fuel to the engine.