Fuel filter losing prime - Ford Powerstroke Diesel Forum
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post #1 of 37 Old 11-14-2018, 07:36 PM Thread Starter
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Fuel filter losing prime

I had a sump installed on my fuel tank. The old fuel line with the blue plastic tab on it was capped since the tank was not removed for the sump installation. I ran 2 tanks of fuel through it and just topped it off for the third time. I drove about 10 highway miles, stopped for 20 min and found a big puddle of fuel when I returned to the truck. Drove it home while it was leaking, put a clamp on the line to stop the flow of fuel. The guy who installed the sump came over and put a different cap on the line and it stopped leaking. Went to drive it to work next morning, got about a mile from the house and truck sputtered and quit while driving. Got it home and pulled the fuel filter cap off and found no fuel in the filter housing. Turned the key and fuel pump pumped the bowl full, as soon as the key was turned off, the fuel started draining down to empty the bowl. But it didnít go on the ground. Not sure where itís going but it wonít keep the fuel in the filter housing.
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post #2 of 37 Old 11-14-2018, 08:26 PM
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It's running back into the tank, likely via the return line.
I thought the upper filter was supposed to have a check valve to help prevent that.

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post #3 of 37 Old 11-15-2018, 05:39 AM
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The check valve is located at the engine head, after both filters. There is an additional check valve located in the HFCM. The Check valves are the circles with the triangles.

I think whatever leak you saw is letting the fuel drain back into the tank. If you can find and fix that leak, I believe your problems will go away. My guess is the leak would be in the sump pump, since the work was done there, but it could be anywhere. I also am not sure the lines need to be primed with fuel to allow the pump to work.
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post #4 of 37 Old 11-15-2018, 05:43 AM
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In 2004 there was a goose-neck (or trap) installed in the fuel feed tubing to the regulator on the secondary fuel filter. It was installed so that the secondary fuel bowl would not drain down.

Do you have an 03 or early 04 engine?
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post #5 of 37 Old 11-15-2018, 06:03 AM Thread Starter
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The fuel pump is getting fuel to the secondary filter bowl and it will overflow all over the place if I leave the key on with the cap off. As soon as I turn the key off, the fuel drains out of the bowl followed by a weak hissing sound like it’s sucking air after all the fuel is out of the bowl.
My truck is a 2006.

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post #6 of 37 Old 11-15-2018, 07:39 AM
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There is a duckbill type valve on the fuel return line to the tank. I wonder if it is allowing air to leak back.

I thought it was fairly low in the tank (submerged) though.

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Last edited by bismic; 11-15-2018 at 10:44 AM.
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post #7 of 37 Old 11-15-2018, 10:32 AM
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I would think you would need to have a leak up top where air is getting in, for it to drain back.
Think of the straw effect.
Regardless, not too terribly hard to pull the sender and look.

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post #8 of 37 Old 11-15-2018, 12:27 PM
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are you having issues or just noticed the fuel bowl draining ?

did the old fuel tank supply line get capped so low outside the tank that it was causing a siphon effect?

have you tried this test with the fuel filler cap off ?

and in case you have not noticed the fuel pump shuts off on it's own after key on but no start ( not that this effects you but just fyi )

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post #9 of 37 Old 11-15-2018, 06:20 PM Thread Starter
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Quote:
Originally Posted by ZMANN View Post
are you having issues or just noticed the fuel bowl draining ?

did the old fuel tank supply line get capped so low outside the tank that it was causing a siphon effect?

have you tried this test with the fuel filler cap off ?

and in case you have not noticed the fuel pump shuts off on it's own after key on but no start ( not that this effects you but just fyi )
The truck wonít run is the issue.

The old line is capped off just above the water separator fuel filter

Yes- thatís how I know the fuel is draining out to the point the bowl is empty. If I leave the key on with the cap off, it will pump fuel to fill the bowl and then it overflows and continues until the key is turned off

Yes I did notice the pump shuts off however thatís not the case when the cap is off. Maybe itís because it doesnít build any pressure with the cap off.
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post #10 of 37 Old 11-18-2018, 09:08 PM
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Quote:
Originally Posted by Whitewater25 View Post
The truck wonít run is the issue.

The old line is capped off just above the water separator fuel filter

Yes- thatís how I know the fuel is draining out to the point the bowl is empty. If I leave the key on with the cap off, it will pump fuel to fill the bowl and then it overflows and continues until the key is turned off

Yes I did notice the pump shuts off however thatís not the case when the cap is off. Maybe itís because it doesnít build any pressure with the cap off.
I noticed my 07 fuel bowl was empty when I changed filter, with longer crank times after sitting. I just bought the truck and was working through the to do list. I installed the blue spring kit and noticed the rubber seal on plunger was deformed looked original. No more long crank times for me, haven't pulled fuel filter though.

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