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Old 11-29-2015, 08:06 PM   #15
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Twinboat, I have checked the shutoff and they are ok...someone did mention to me that if the return line back to the tank was stopped up it could be flooding itself out. Does that sound right?
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Old 11-29-2015, 08:14 PM   #16
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No, I don't think so, you would see a lot of black smoke.

Stick a clear hose in the return fuel line, watch for bubbles.
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Old 11-29-2015, 08:16 PM   #17
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No, I don't think so, you would see a lot of black smoke.

Stick a clear hose in the return fuel line, watch for bubbles.
Or you could put the end of the hose in a bucket with a gallon of fuel. Submerge the end and watch for air bubbles.
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Old 11-29-2015, 08:21 PM   #18
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Or you could put the end of the hose in a bucket with a gallon of fuel. Submerge the end and watch for air bubbles.

Are you referring to the return line at the engine or back at the tank?
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Old 11-29-2015, 08:44 PM   #19
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At the tank, then you don't need Another line. Any bubbles means your sucking air, before or at the pump.

If you get bubbles, try a short hose right from the pump to a can of clean fuel. If it still bubbles, the pump seal could be bad.


Steady clear stream of fuel means you have an air problem.
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Old 11-29-2015, 08:50 PM   #20
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At the tank, then you don't need Another line. Any bubbles means your sucking air, before or at the pump.

If you get bubbles, try a short hose right from the pump to a can of clean fuel. If it still bubbles, the pump seal could be bad.


Steady clear stream of fuel means you have an air problem.
Thanks twinboat...I thought a steady stream of fuel was a good thing...lol...I will try that soon!
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Old 11-30-2015, 06:18 AM   #21
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Seems to me if it was running good before you changed your filters something is wrong there.

So on the fuel. Start over and pull the filters again. Make sure you clean filter base good and reinstall. Maybe getting some air there.

On the air. Not see how it is there unless something had plugged the intake. But even that should not cause it to be hard to start first time.

By it being hard to start leads me to ail leak at the filters. Also would not allow it to run high RPM. I would think tho you should see some fuel leakage around the filter when you shut it down.

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Old 11-30-2015, 06:49 AM   #22
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OP never said it was running good.

Detroit Diesels plug the air intake as an emergency stop.

Fuel filters sucking air will be near empty. Nothing to leak out.
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Old 11-30-2015, 06:57 AM   #23
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It sounds like you are sucking air, I had a filter housing crack one time and was sucking air ans doing just what you are talking about, found it by taking the fuel line off at the tank and using a hand pump that transfers fuel to pressurize the fuel line and and found the fuel pouring out the housing, without pressurizing, would never have found it. A plugged return line will fill the crankcase with fuel.
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Old 11-30-2015, 07:43 AM   #24
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Seems to me if it was running good before you changed your filters something is wrong there.

So on the fuel. Start over and pull the filters again. Make sure you clean filter base good and reinstall. Maybe getting some air there.

On the air. Not see how it is there unless something had plugged the intake. But even that should not cause it to be hard to start first time.

By it being hard to start leads me to ail leak at the filters. Also would not allow it to run high RPM. I would think tho you should see some fuel leakage around the filter when you shut it down.

Russell
The people who gave it to me had just taken it all over Texas because his wife was a travel nurse and said it started losing power just as they were getting in town. It is not hard to start at all, it busts off everytime, just won't stay running.
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Old 11-30-2015, 07:46 AM   #25
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Just to add, I have cranked it then went back and crawled on to of the engine to watch the shutoff on top of the blower and when it die the shutoff never moved.
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Old 11-30-2015, 08:23 AM   #26
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That sounds more like a collapsed fuel line or blockage. Didn't realize it quit running right before filter change

Russell
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Old 11-30-2015, 08:32 AM   #27
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Just a WAG, could you have a severly restricted exhaust system for some reason. I ran into this once eons ago on a 471 engine on a piece of construction equipment.
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Old 11-30-2015, 12:01 PM   #28
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I agree with Russell check for a blocked pick-up tube in the tank (junk in tank) and recheck the fuel filters to make you didn't leave the old O-Ring on with the new one (double o-rings will cause an air leak in fuel system)
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