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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Perkins 4108 motor getting air
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Thread: Perkins 4108 motor getting air Reply to Thread
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Topic Review (Newest First)
04-13-2010 04:11 AM
CarelessNavigator
Quote:
Originally Posted by lbair View Post
We have checked the fuel lines, the fuel filter, the return lines, got to the lift pump and found moderate fuel on the outside of it, all other leads exhausted but this...we ordered a lift pump today..... any leads or pointers!!!! The motor will run approx an hour then will accelerate up several times and then quits...
Air in the fuel system indicates a leak on the primary/suction side of the fuel system. A fuel leak is always going to be on the secondary/pressure side of the fuel system.

Symptoms of air in the system would be, hard starting, surge at idle or rough idle, engine misses under load, low power.

Symptoms of a leak would be, hard starting, engine misses under load, low power, excessive fuel consumption and of course fuel all over the place.

Good Luck!
04-12-2010 09:51 PM
lbair thanks - thats reassuring to hear!! we hope to be sailing again this wknd
04-12-2010 09:32 PM
poopdeckpappy
Quote:
Originally Posted by lbair View Post
The motor will run approx an hour then will accelerate up several times and then quits...
Wow, you got an hour ??, I only got 30-45mins before my 108 did the same, changed the lift pump and it has run like a champ since.
04-12-2010 09:21 PM
lbair the motor was run at the dock before putting her away and then again when launched, until last wknd when was towed back to dock, then rechanged all filters, checked hoses, had a mechanic look at her and he checked back to fuel tank and moved towards the engine where he found a moderate amount of fuel on the lift pump.....
04-12-2010 08:55 PM
sailingdog Did you run the engine after changing the filters in the fall or before changing the Racor filter?
04-12-2010 08:37 PM
lbair nothing has been changed since I changed the filters in the fall, re-changed the racor filter this wk, fuel tank was replaced in 05....and other leads???
04-12-2010 08:32 PM
Capttman Very possible that the fuel filter gasket is not seated properly or the bleeder screw on top of the filter needs a new O ring
04-12-2010 08:31 PM
sailingdog What was the last thing changed on the engine's fuel system??? As a general rule, if the engine was working previously and something was modified, upgraded, changed, and the engine isn't working properly, it is most likely something that you touched in the last modification, upgrade or change.

One thing to check are the banjo bolts and crush washers. If you overtightened the banjo bolts—that can result in a leak in the fuel system.

Another thing to look at is the fuel pickup tube in the fuel tank. If the pickup tube has a screen on it, and many come that way, it could be clogging up and causing the surging and dying.
04-12-2010 07:57 PM
lbair
Perkins 4108 motor getting air

We have checked the fuel lines, the fuel filter, the return lines, got to the lift pump and found moderate fuel on the outside of it, all other leads exhausted but this...we ordered a lift pump today..... any leads or pointers!!!! The motor will run approx an hour then will accelerate up several times and then quits...

 
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