Does anyone know the size of the clear fuel hose that goes from the
spin-on filter assembly to the injection pump? Also is there a particular brand/type recommended due to the heat these lines are exposed to?

You can replace it with 1/4" ID Regular Fuel Hose from the Auto Part Chain Stores; that Hose is also rated for Diesel. And, you will need Hose Clamps.

To get the Old Plastic off you need to heat it just enough to soften it and pull it off. That can be done with a Butane Lighter or a Candle.

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84 300D, 82 Volvo 244Gl Diesel

it's a pressure hose, so replacement is best done at a dealership, as it's a special clear hose.
there have been members that have changed the hose with other hose, using clamps etc, but you lose the clear functionality of seeing if air is in the line.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

i have removed that line in place i have put a large filter... i would say you do not need to go to the dealer to replace... just go to your local parts place and ask for some 1/4 fuel hose and get some fuel injection hose clamps not the normal hose clamps...

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85 mercedes 300D-T 258k miles

The hose appears to be polyurethane clear hose.

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1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."

did you put back clear hose? or is your filter now the bubble checker?

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I changed mine to Rubber Hose for the same reason.

You can buy all of the Plastic Fuel Lines; but at some expense. The real advantage of the Plastic Lines is longivity.
I donot see a huge advantage in being able to observe Air Leak Bubbles because the Plastic Tubing is gong to discolor and make it hard to observe bubbles and the symptoms of an Air Leak are obvious.
Not to mention there is really only 3 common sources of Air leaks. The FueL inlet Hoses, the Plastic Primary Filter or the Hand Primer.

A long time ago one of our members replaced his Plastic Tubing with I think it was Tygon; the US equivilant of what the Germans used. But, that suff is extremely stiff to get back on the Hose Barbs of the Fittings. He said He heated up the Plastic and shoved it on.
I did not think I would have success at that so I went with the Rubber Hose.

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84 300D, 82 Volvo 244Gl Diesel

Could be some answers here:
240D Transparent Fuel Line Replacement Tips?
240D Transparent Fuel Line Replacement Tips?

The tubing on my spare IP has: DIN-78878-PA-TECALAN-79 a arrow and a bunch of widley spaced 2 digit numbers?
When I looked several years ago TECALAN does not seem to be sold here in the US.

Another related thread.
Clear Fuel Tubing

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84 300D, 82 Volvo 244Gl Diesel

of Tygothane clear fuel line usable tubing.Bio-Diesel and WVO proof.
It is Pressure rated far above our uses,and comes in a "Strengthened" version
also.

U.S. Plastics is the vendor.

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'84 300SD sold
124.128