Air in Diesel pipe

[Alexmj76]

Hi guys,

I am having a problem with air in my fuel lines (pictured) I have not had the van long as was like this when i bought it so i am not sure if the air is the result of a previous repair to something or if air is leaking in from somewhere. I have looked for any signs of diesel leking and cannot see anything.

Firstly, i would like to try and bleed the air out to see if any air goes back in. If it does then i will know it needs more investigation to find out where its getting in.

So, is there anybody here that can help me with a suggestion on how i may be able to get the air out of the lines?

The van has a problem starting like this unless i give the hand held diaphragm a couple of squeezes (which always soft until pumped)

The pictures are of the air in the lines.

Cheers in advance

[trader97]

Hi there,

air leaks can occur at any joint in the pipe really but I would check the thin rubber diesel return (Leak off) pipes for splits etc. Another place to check would be the filter housing and even the rubber priming bowl.

Fuel generally wont leak out unless its a bad split as its being drawn through and under no pressure on that side of the pump. I found a leak a few years back by pumping the primer until the fuel lines were under pressure and it forced fuel out where the leak was.

Can be a pain to find sometimes but needs addressing, I have read it is possible to fit a non-return valve in the line to prevent fuel draining back.

Hope this is of some help.

[Alexmj76]

Hi there,

air leaks can occur at any joint in the pipe really but I would check the thin rubber diesel return (Leak off) pipes for splits etc. Another place to check would be the filter housing and even the rubber priming bowl.

Fuel generally wont leak out unless its a bad split as its being drawn through and under no pressure on that side of the pump. I found a leak a few years back by pumping the primer until the fuel lines were under pressure and it forced fuel out where the leak was.

Can be a pain to find sometimes but needs addressing, I have read it is possible to fit a non-return valve in the line to prevent fuel draining back.

Hope this is of some help.

[brodfather11]

That amount of air in the fuel lines is not uncommon, and will not cause starting problems. Doesn't really matter what you do and if you do remove the air bubbles the next time you stop start they will be back.

[Alexmj76]

Ok, so i am trying to understand this with what you have said and being the engine starts after the hand primer has been pumped until its hard.

I have already changed the glow plugs which i done when i first bought it.