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Old 02-03-2019, 08:08 AM   #1
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Help...dead in the water, air in fuel lines!!!

I ran a fuel tank dry by accident and have air in the lines. We have found there is no fuel going to the fuel manifold. We have tried everything. We believe the air is in the fuel lines where they go up then back down into the manifold. Fortunately we have a full forward fuel tank. Currently transferring all fuel to an aft tank and hoping the fuel level will be higher than the highest point of the fuel line.


Any ideas?
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Old 02-03-2019, 08:24 AM   #2
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You need to prime your motor. I have a slight air leak and if I don't close my fuel valve I lose prime. Paid a guy $$ to prime my motor after doing my filters. I'm gonna rig up a priming pump this season. What's the pump looking thing in second pic above racor ?
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Old 02-03-2019, 08:28 AM   #3
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I’m trying. I now have fuel in the manifold but i can’t get it to the engine. Little plunger pump doesn’t seem to do anything. Fuel line cracked off screw on filters to the injection pump. No fuel going to the pump.


Edit. Now I have fuel to the priming pumps. But I still can’t get fuel out of the filter housing. I’ve been pumping for a while. I hear fuel moving around and what sounds like air.
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Old 02-03-2019, 08:45 AM   #4
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I was told to use starting fluid and that would be enough to fire motor and draw fuel into pump. I didn't want to try that. Make sure all filters are full of fuel and valve is open and just keep pumping.
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Old 02-03-2019, 08:57 AM   #5
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Did you spin the tops off the Racors and fill them with fuel (or Diesel Kleen). I have the little plunger pumps on the secondary fuel filter fitting, and they would take forever to fill a Racor. They do feel like they’re doing nothing, and take a little while to purge all the air, even after filling the Racor.
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Old 02-03-2019, 08:59 AM   #6
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That little plunger pump looks to have a wire coming from it. If it is 12volt and it were me I would try to get that pumping, may be even running a temporary wire and then open and bleed all the lines from the farthest point to the closest point to the engine right up to the injectors.
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Old 02-03-2019, 09:00 AM   #7
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I now have generator running.

Racors are now full. Still canít get fuel out the cracked lines. Iíll just keep pumping. Must be getting close
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Old 02-03-2019, 09:01 AM   #8
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Greetings,
Mr. S. IF you have Lehmans, the arm that rides the cam lobe, inside the motor, MUST be completely off the cam lobe or the priming lever on the fuel lift pump will have little to no effect. Try a very quick bump of the starter to see if that makes any difference. May have to bump a few times...
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Old 02-03-2019, 09:02 AM   #9
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Bump the engine over. The cam on the lift pump my be at the high lobe.

Edit: Your fast RTF.
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Old 02-03-2019, 09:10 AM   #10
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I have fuel going out of these filters that go into the injection pump. No fuel out the lines. Iíve been pumping manually and with the electric priming pump. I honestly donít get it
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Old 02-03-2019, 09:12 AM   #11
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Open the vent on top of the engine mounted fuel filter. Use the electric pump in the photo to push fuel into system. It will flow through the engine mounted lift pump.

Fuel will not flow through the injection pump to injectors unless the engine is rotating, so don't expect any fuel at injector lines. Just need to get the body of the pump full, then use starter.
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Old 02-03-2019, 09:13 AM   #12
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Greetings,
Mr. LM. Thanks. Now that you've put it in print I can show it to those nay sayers who think I'm not too swift...


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Old 02-03-2019, 09:16 AM   #13
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No fuel out the injector line while cranking.
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Old 02-03-2019, 09:19 AM   #14
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Quote:
Originally Posted by Ski in NC View Post
Open the vent on top of the engine mounted fuel filter. Use the electric pump in the photo to push fuel into system. It will flow through the engine mounted lift pump.

Fuel will not flow through the injection pump to injectors unless the engine is rotating, so don't expect any fuel at injector lines. Just need to get the body of the pump full, then use starter.
Ok did that. Got a puff of air then fuel. Now just fuel come out. Tightened it up. Still no fuel out of injector.
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Old 02-03-2019, 09:27 AM   #15
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Do you know about the 2 bleed screws on the injector pump rather than cracking lines?

And starting with the throttle full forward and pulling back once it catches?
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Old 02-03-2019, 09:29 AM   #16
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Quote:
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Do you know about the 2 bleed screws on the injector pump rather than cracking lines?

And starting with the throttle full forward and pulling back once it catches?
No I didnít.
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Old 02-03-2019, 09:31 AM   #17
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Have you shut off your threw hull to the engine? Water will fill water your water lift muffler and run back into the engine with continual cranking with no exhaust gas/pressure to push the water out. You don’t want to hydrolock your engine.
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Old 02-03-2019, 09:32 AM   #18
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Shouldnít the shut off Solenoid pull open while cranking?
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Old 02-03-2019, 09:32 AM   #19
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Have you shut off your threw hull to the engine? Water will fill water your water lift muffler and run back into the engine with continual cranking with no exhaust gas/pressure to push the water out. You donít want to hydrolock your engine.
I havenít. Iíll do it now.
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Old 02-03-2019, 09:36 AM   #20
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It takes about 75 pumps on mine to fill the secondary filters on the engine. Seems forever.
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