Jump to content
  • Announcements

    Welcome! New around here? Take a look at the New Members' Guide for some pointers.

    Not a member yet? Sign up here and you can soon be chatting away with friends old and new..

    Check out our Handy Information section if you're after something quickly!

loss of power


Recommended Posts

Hi

On a recent sea trip to Southwold in a bit of a swell, my port engine started to lose power and as we carried on it slowly got worse.

Once we were safely in port, we changed the engine filters and cleaned the pre filters as we had no new pre filters on board.

The engine filters did have some debris in them, (engine filters are 2 microns and pre filters are 10 microns) however prior to this trip when I had some work done on the boat, I had the port side pre filter replaced as it had a slight leek on the racor water seperator gasket.

I don't know if they just took the old filter out and put a new one in without cleaning it out or draining it off, and this may have caused the problem at sea.

The return trip the next day went well for about 20 mins, but then we started losing power again and this time after 10 mins the engine cut out. Once in Lowestoft I took the filter lid off and noticed that the fuel was half way down the filter so I tried to bleed the system up again got it running but not very well.

I am going to the boat to have a look at it this week and wonder if anyone has any ideas

The diesel is a nice bright red in the tank and it 3/4 full.

cheers Barry

Link to comment
Share on other sites

If the primary bowl was not completely full it may be that there is a partial blockage between it and the tank after the tank has been shaken up, this may never present itself at low revs, there also may be an air leak in the primary dragging air in, possibly a combination of both. Try blowing back through the fuel line with compressed air and make sure the gaskets and unions are all sealed fully. That's probably the simplest place to start before looking for more complex (and expensive) issues like lift pumps et all. One final thought, if you have seperate tanks then it is worth checking the vent on the one that supplies that motor.

Link to comment
Share on other sites

Is it possible that crap in the bottom of the tank is causing an intermittent blockage of the pick up pipe?

We had a weird sort of diesel bug in one tank at work, can only describe it as looking like a flower petal that resulted in two vehicles suffering from problems in gauze filters in the fuel pump rather than the normal filters.

Link to comment
Share on other sites

I am with a check of the seal on the Racor Primary.

I had a Separ Primary that was a real pain to get a good seal based on the design and had an occasion where air ingress did what you describe Baz eventually causing the engine to stop. Fortunately this was just running in the marina.

I changed to a Racor style but can imagine if the seal is not good this could be a cause.

I think as David has alluded I would try checking the simple things first before digging deeper.

Link to comment
Share on other sites

I am with a check of the seal on the Racor Primary.

I had a Separ Primary that was a real pain to get a good seal based on the design and had an occasion where air ingress did what you describe Baz eventually causing the engine to stop. Fortunately this was just running in the marina.

I changed to a Racor style but can imagine if the seal is not good this could be a cause.

I think as David has alluded I would try checking the simple things first before digging deeper.

I am down to look at it tommorrow and I too think its an air issue, as the lift pump when I hand prime it pulls the diesel up easily so I would say the diafram is fine in the lift pump. the seal on top of the racor fuel seperator is quite hard which could maybe letting enough air in to cause the problem. But with my luck it will be the most exspensive option as always :cry

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • NBN Mobile App

  • Our Sponsors

    Norfolk Broads Network is run by volunteers - You can help us run it by making a donation

×
×
  • Create New...

Important Information

For details of our Guidelines, please take a look at the Terms of Use here.