DD 8.2 Stall.

[Hawgwash]

Buddy in the boonies.
Imaculatly maintained 8.2s.
New filters and long run.
12 hours, shut down.
Next morning no start.
Changed filters.
Start right up.
Long run, 28 hours, shut down.
Next morning no start.
Remove filter, not changed, put back on.
Start right up.
Primary gauges show no issue.
Secondary is the issue.

 

[DavidM]

There is probably an air leak in the fuel supply hoses and piping that lets air in after shutdown so it won't start the next morning until bled. Inspect and tighten all fittings.

David

 

[Hawgwash]

There is probably an air leak in the fuel supply hoses and piping that lets air in after shutdown so it won't start the next morning until bled. Inspect and tighten all fittings.

David

doing a Delorme relay, thanks David.

 

[seasalt007]

What djmarchand said plus when it shuts down are the filters dry?

 

[Hawgwash]

What djmarchand said plus when it shuts down are the filters dry?

sorry, I used the word stall. Not true. Shuts down normal after running. Just won't start in the morning until filter is taken off and put back on. Starts right up. Runs long time.

 

[DavidM]

sorry, I used the word stall. Not true. Shuts down normal after running. Just won't start in the morning until filter is taken off and put back on. Starts right up. Runs long time.

I understood that when I replied earlier.

What I think happens is during normal running the fuel injector system can accept a little air leaking in and keeps running. But when you shut down, the fuel system is still under a partial vacuum. That pulls in air if there is a leak in the system. That air forms a pocket that blocks the fuel injection pump when you try to start it the next morning.

When you change the fuel filter you probably bleed it so it can start again. Then you go through the whole cycle again on the next shutdown.

Will it restart immediately after shutdown? If so that seems to confirm my theory.

David

 

[Hawgwash]

David;
From the hinterlands...

Thank your friends for the help. It's appreciated.

Will check everything when system cold. If I can't seem 2 solve will change hoses when back home if can wait until then.

Rivers Inlet crossing is nearly a lake today. Usually large swells on beam & chop.

We are just passing 2 sleeping humpbacks. Sure nice 2 see them around.1st ones this year.

Thanks from me too David.

 

[Rufus]

The injection pressure on an 8.2 is via the cam operated injectors (as for the DD 2-strokes). So air in the system is not a the same problem as for a system with an injection pump. I've never had to bleed anything following a filter change. I have seen this happen on occasion and believe it was a sticking 12V fuel solenoid. When the "ignition" key was cycled off and on a few times it would fire.

 

[Hawgwash]

Thanks Rufus.

He's going to sniff around this morning after he takes the dogs ashore. Priorities, y' know.

Right now he is in Remotesville Cove (another name for BruceK's list) with 5 Humpies and not too concerned about a little air leak.

Really do have to marvel at the technology now though. Me doing a relay between the east coast and some way off hole on the west coast.

 

[Hawgwash]

So, he went over everything he could get at and didn't find anything. Did get a 1/8" tweak on 2 fittings above the secondary. That's it.


See what happens.

 

[chc]

Never had to bleed my 8.2's after filter changes; occasionally had to crank a bit more than usual; usually 'cause I didn't fill filters enough. Have had some solenoid issues a couple of times, tho'. One bad connection at the solenoid; one that was sticking a bit until tapped; & one when the alternator was feeding current into the system & the engine would not shut down w/the key. That solenoid has been replaced.

 

[Lepke]

My DD experience is all 2 stroke, but about 60 years worth. The only times I had a problem like yours was when I had a pin hole leak in the fuel line between the primary filter and DD fuel pump. I couldn't find the leak until I put an electric fuel pump inline and built up pressure. Another way would be air pressure and listen. Since then I have always installed an electric after the Racor to aid in flushing air when changing secondary filter or after long periods of non use. The electrics don't run when the engine is running and the DD fuel pump pulls thru them. They're sized to meet the normal volume, so also serve as backups.