Howdy,
The MEP-8xx series of generator all use diesel fuel return lines. After sometimes sitting with no fuel, or heat cold, no-use etc... they start to fail. The main issue is the lines start weeping fuel.
NSN 4720-01-483-6467 part N20353.5 HOSE,NONMETALLIC
Name | Value |
CROSS-SECTIONAL SHAPE STYLE | ROUND |
INSIDE DIAMETER | 3.5 MILLIMETERS NOMINAL |
LAYER COMPOSITION AND LOCATION | OUTER LAYER BRAIDED COTTON CORD |
INSIDE SURFACE CONDITION | SMOOTH |
SPECIAL FEATURES | COMES IN A 20 METER ROLL (66 FT.) |
MATERIAL | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR TUBE |
MEDIA FOR WHICH DESIGNED | FUEL/OIL, HYDROCARBON SINGLE RESPONSE AND WATER SINGLE RESPONSE AND AIR SINGLE RESPONSE |
The fuel return line is 3.5mm ID. As you can see by the above posting the details of this line. Some have used other sizes and hose clamps. But purchasing the correct 3.5mm ID fuel hose makes it stay tight on all the hose barbs without issue.
I found the proper product at autoplicity. It is a 3.5mm ID fuel hose made by CRP CONTITECH. This is a roll which is 5 meters long which will give you enough to replace all your lines and have some in reserve. You can search for below
CRP N203535-5 CONTITECH Diesel Hose