Looking for input on simplest and reliable way to convert 5/16 hose to 3/8 hose - PeachParts Mercedes-Benz Forum

Texasgeezer · #1 02-03-2018, 08:12 PM

Thanks for the hose clamp suggestion. I wanted to use the less damaging Mercedes type hose clamps but dealer parts dept said they were not available. Found similar but not as good injection hose clamps that work but still don't form perfect circle.

The engine is so clean because the previous owner seldom used the car. I did power wash it just before I started doing work in that area.

OM617YOTA · #2 02-04-2018, 11:23 AM

Why not go somewhere else and buy a 5/16" fuel filter? This really seems like the long way to grandma's house.

Also, why remove three o rings failure points, only to add in valves and tees, which are additional failure points. Not understanding the logic there.

funola · #3 02-04-2018, 12:25 PM

Quote:

Originally Posted by Texasgeezer

Thanks for the hose clamp suggestion. I wanted to use the less damaging Mercedes type hose clamps but dealer parts dept said they were not available. Found similar but not as good injection hose clamps that work but still don't form perfect circle.

The engine is so clean because the previous owner seldom used the car. I did power wash it just before I started doing work in that area.

These are the constant tension spring clamps I mentioned earlier..

https://www.ebay.com/itm/10Pcs-6-15mm-Spring-Band-Type-Fuel-Vacuum-Hose-Silicone-Pipe-Tube-Clamp-Clip-Hot-/142271891811?var=&hash=item212010c963

I bought 10 of ea size which didn't cost much and has come in handy already.

How long are the sections of 5/16" hose you have replaced with 3/8"? If restriction and bubbles due to the smallish 5/16 hose was the problem, have you thought about replacing it with 3/8 all the way back to the tank? Maybe even going to 1/2".

ROLLGUY · #4 02-04-2018, 01:19 PM

It may be too late, but you could use half of a cigar hose from a 123. The ends are 5/16, and the hose gradually expands to about 1/2".