I am planning for a project to replace all of the fuel lines on the Yanmar 4JH4E on our Hunter 41AC. I have sourced the 5/16" line that runs from the tank to the primary filter and from the secondary filter back to the tank as well as some 1/4" line for some of the shorter runs on the engine. What I have not been able to find is some 3/16" I.D. for the return line from the injectors to the secondary filter. The hose that is there currently has the notation "ISO 7840-A2-CE-RCD-433". Does anyone have any suggestions as to where I might get some? The local chandlery and West Marine had 1/4" as their smallest stocked size.
Sourcing Diesel Fuel Line
- Thread starter dkinzer
- Start date
Napa... https://www.napaonline.com/en/p/SME188052
Gates..https://www.gates.com/us/en/fluid-power/engine-hose/fuel-line-hose.html
any diesel fuel line. No marine source will be less expensive.
The ISO standard has been updated.
Gates..https://www.gates.com/us/en/fluid-power/engine-hose/fuel-line-hose.html
any diesel fuel line. No marine source will be less expensive.
The relevant standard for USCG fuel hose is SAE J1527DEC85, Class 1 or (UL) Standard 1114 per 33CFR § 183.540 Hoses: Standards and markings.
The issue for Yanmar is the hoses are metric. SAE sized hoses will work if enough clamping pressure can be developed, which in some applications it can not.
The issue for Yanmar is the hoses are metric. SAE sized hoses will work if enough clamping pressure can be developed, which in some applications it can not.
A 5mm I.D. is 0.197 whereas 3/16" is 0.1875. So a 3/16" I.D. hose will fit tightly on a 5mm barb. Comparatively, a 6mm I.D. hose is 0.235 while a 1/4" is 0.250 which would fit loosely on a 6mm barb. Continuing, an 8mm I.D. hose is 0.315 while 5/16" is 0.313 so 5/16" would fit snugly on a 8mm barb. A 10mm I.D. hose is 0.394" and 3/8" is 0.375" so it would fit tightly on a 10mm barb.
I ordered some 5mm I.D. ISO 7840 hose from a U.K seller on eBay. We'll see how well it fits the Yanmar.
I ordered some 5mm I.D. ISO 7840 hose from a U.K seller on eBay. We'll see how well it fits the Yanmar.
You appear to live in/near Portland. Just wander over to Premier Rubber & Supply - Industrial & Hydraulic Hoses & Fittings
They have provided all of our replacement hoses for fuel, water, and whatever for decades.
Usually the major challenge is your engine having a metric fitting where you did not expect.....
They have provided all of our replacement hoses for fuel, water, and whatever for decades.
Usually the major challenge is your engine having a metric fitting where you did not expect.....