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HPDI fuel filter question

Old 03-21-2019, 03:25 PM
  #1  
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Default HPDI fuel filter question

Just did a replacement on my racor (10 micron) and the first fuel filter on the side of the motor.

When I shut the motor off the clear fuel filter bowl on the side of the motor is full. When on or running it drops to about 75% at idle.

Question is: is this normal? Where does the motor Draw from the filter or bottom of the bowl?

my concern is if itís the filter itís already close wonder what will happen at 5200 rpm. Iíll run it in a week
or two but if this isnít right Iíd rather figure it out now. Donít know what I could have done wrong simple as drop bowl change filter and pump prime bulb right?

see photo this is at idle.

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Old 03-21-2019, 03:57 PM
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You are drawing air from somewhere ( may just be from opening the bowl and some air got into the lines). I dont have the HDPIs but I do have the OX66s that have the same water separator filter. EVERY time I change filters I have the same issue. So far not problems and after a few hard runs it stays full. I don't think its abnormal. Same thing happens when I change my Racors. Engines have never missed a beat.
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Old 03-21-2019, 04:55 PM
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Originally Posted by EMC Pursuit View Post
You are drawing air from somewhere ( may just be from opening the bowl and some air got into the lines). I dont have the HDPIs but I do have the OX66s that have the same water separator filter. EVERY time I change filters I have the same issue. So far not problems and after a few hard runs it stays full. I don't think its abnormal. Same thing happens when I change my Racors. Engines have never missed a beat.
got it I guess Iíll run it hard by myself one time before anyone else gets on it so if thereís an issue itís just me. Might be because I didnít fill it all the way before screwing the racor on but I figured primer bulb will handle that

i tightened the racor by hand and kept going till I couldnít go anymore - thatís fine right? I always get worried about not tight enough then too tight.

sorry for the newb questions - I usually pay for service but wanted to take over the usuals

Last edited by General Disarray; 03-21-2019 at 05:05 PM.
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Old 03-21-2019, 05:06 PM
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Completely normal for the gasoline level in that filter bowl to be where it is.

Pump the primer ball to bleed all air from the filter bowl. Go and use the motors. The fuel level will go back down to where it was when you started.

Air in the bowl does not matter. Any air in the fuel will be vented when the gasoline gets to the vapor separator tank. That is what the vapor separator tank does.
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Old 03-21-2019, 05:11 PM
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Originally Posted by alloyboy View Post
Completely normal for the gasoline level in that filter bowl to be where it is.

Pump the primer ball to bleed all air from the filter bowl. Go and use the motors. The fuel level will go back down to where it was when you started.

Air in the bowl does not matter. Any air in the fuel will be vented when the gasoline gets to the vapor separator tank. That is what the vapor separator tank does.
got it was just worried the draw may come down too low for the pickup but I assume the pick up is at the bottom of the bowl and not the actual filter?
fuel level gets down to the bottom of the paper filter once kicked in gear at idle speed

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