Bleeding air in my Bl***ding Diesel

[Talbot]

I installed a new fuel tank last winter. The system was perfect up until beginning of this month. Now there is stacks of air getting in from somewhere. I have checked all pipes - none are degraded, and I cut of the ends of all of them and made sure that they were seated correctly and the jubilee clips were tight. Stlill getting air in. (I have a smaller transparent filter after the fuel pump, which shows me when there is air in the system, and allows me to bleed from that one point using the fuel pump feed to provide the pressue - I can actually see bubbles of air getting into this filtewr) Does the forum have any suggestions, or I will have to pull all the fittings apart again and also detach the fuel tank fittings to check them - I was looking forward to a sail today but thought I would check the engine first. At least it saved an embaraasing /possibly dangerous engine cut-out.

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[oldharry]

If this has happened suddenly, it is most likely to be the diaphragm in the fuel lift pump.


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[polarity]

check the internal pipe into the fuel tank - is there a joint above the level of fuel?

Paul

<hr width=100% size=1>Paul
<A target="_blank" HREF=http://www.polarity2.com>http://www.polarity2.com</A>

 

[Talbot]

This is where I suspect the problem is. I will pull this apart and re-assemble (might as well change the filter in the CAV filter at the same time) I will check with yanmar about the lift pump, as I am not sure how this particular one works. If there is a diaphram I will replace it.

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[rich]

I would not trust jubilee clips, what sort of pipe are you using, I prefer nylon or copper with ferrules and flexible braid pipe to engine.

<hr width=100% size=1>rich ) <A target="_blank" HREF=http://www.jersey-harbours.com>http://www.jersey-harbours.com</A>

 

[Cloven]

I had the same problem which I found to be minute holes in 10 year old plastic piping - too small for diesel to get out but with the suction of the engine running, big enough to let air in. Solution was as per other reply, replace all piping with copper, obviously apart from the last connection from the fuel system to the engine which needs to be flexible.

Problem now solved & running fine for 3 seasons



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