Fuel Supply/Lift Pump kit; see post #7 for list of kits by Engine

Bosch FP/K22MW22 Feed pump

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84 300D, 82 Volvo 244Gl Diesel

It is perfectly normal for a bubble of air to be trapped in the Pre-filter – in reality it is not trapped there. Air is entering the Spin-on filter continuously as it is flushed out of the Pre-filter. The Spin-on filter is designed to cope with it. The source of the air is fuel foaming in the tank as it sloshes around - ever filled your tank right to the top and had to wait for all the lather to settle?

Once the fuel system has been fully bled it is impossible for air entering the main Spin-on filter to reach the Fuel Pump L/P chamber unless:
a) The filters, tank strainer or fuel lines are blocked
b) You run it out of fuel.

That is quite right what you describe. When you fill a new filter from the “In” end a bubble is trapped inside the screen – air can’t permeate through the fine screen, unless under pressure, once it is wet

Right! Fill it from both ends before you connect.

The functionality of the lift pump can be thoroughly checked in less than 1 minute by removing the hose from the steel return line and checking for a steady flow into a can at idle that increases with RPM. Remember well over 90% of fuel by-passes the IP and returns to the tank for cooling. This is also a good check on the state of your filters - a dribble means its time to change them.

Don’t worry about the bubble its best to mount the filter horizontally.

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Beagle

[QUOTE=Beagle;2857589]It is perfectly normal for a bubble of air to be trapped in the pre-filter – in reality it is not trapped there. Air is entering the primary filter continuously as it is flushed out of the pre-filter and the Primary filter is designed to cope with it. The source of the air is fuel foaming in the tank as it sloshes around - ever filled your tank right to the top and had to wait for all the lather to settle?

Once the fuel system has been fully bled it is impossible for air entering the Primary filter to reach the Fuel Pump L/P chamber unless:
a) The filters, tank strainer or fuel lines are blocked
b).[/QUOTEc

I do not believe the comments in the fist paragraph. If you connect a longer Fuel Inlet Hose and run it into a separated container of Diesel Fuel (with no air Bubbles in it) you will find your Bubble still in the Plastic Filter.

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84 300D, 82 Volvo 244Gl Diesel

Your comment makes no sense I think you had better read my first paragraph again.

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Beagle

Cool, thanks Beagle, should have thought of this myself. Lift pump seems fine. Good flow at idle going back to tank.

I will now empty the tank and check the screen.

Diesel 911, thanks for the link to the lift pump kits, I search forever and couldn't find it. Has been bookmarked for the future.

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1994 Toyotal Landcruiser 220k (Sold)

1987 300TDT 278K My Addiction (Going Going Gon...)

2001 Volvo V70 (New Ride)

"It is perfectly normal for a bubble of air to be trapped in the pre-filter – in reality it is not trapped there. Air is entering the primary filter continuously as it is flushed out of the pre-filter and the Primary filter is designed to cope with it. The source of the air is fuel foaming in the tank as it sloshes around - ever filled your tank right to the top and had to wait for all the lather to settle?"

If you stick a longer Fuel Inlet Hose (as a test) into a small separate Container of Diesel Fuel it cannot slosh around and Foam. Yet, you will still have a stationary bubble in your Plastic Primary Filter.
The Bubble in the Primary Plastic Filter must be stationary because no Air is being pulled in from the small Container of Fuel to keep the Bubble filled up and the Bubbles size does not decrease.
So I believe the Air Bubble is indeed trapped inside of the Plastic Primary Filter.

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84 300D, 82 Volvo 244Gl Diesel

Astonishing! C'mon - WAKE UP! Welcome to my "ignore" list.

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Beagle

Well, the good news is, the tank screen was totally clean.

Bad news for me is that, I'm going to have to drive it until it dies again at speed and figure out my problem.

Thanks guys, I appreciate everyone's input.

Let's end this thread and call it a learning experience.

Happy New Years

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1994 Toyotal Landcruiser 220k (Sold)

1987 300TDT 278K My Addiction (Going Going Gon...)

2001 Volvo V70 (New Ride)

OK; ignore me.
But, these are some of the comments I remember reading:
Originally Posted by Beagle
"Your comment makes no sense I think you had better read my first paragraph again."
I went back and looked at the Paragraph agauin and this is part of what I read in the paragraph:
"It is perfectly normal for a bubble of air to be trapped in the pre-filter – in reality it is not trapped there."

Perhaps it was just a bad choice of words. To me this means the bubble is trapped but then you say it is not trapped; and it cannot be both.

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84 300D, 82 Volvo 244Gl Diesel