Biodiesel fuel line replacement on '82 720 SD22

SD diesels were widely available in the US in the 1981-86 Datsun/Nissan 720 pickups, and in Canada through '87 in the D21 pickup.

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ocd
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Joined: 13 years ago
Location: Portland, OR

#31

Post by ocd » 13 years ago

here is an interesting little tech tip pdf on different fuel lines and there applications discussing SAE30R9 and r7(inadequate for bd or high pressure) and r10 for in tank/ submerged applications

http://www.gates.com/common/downloads/f ... psForm.pdf

scroll down a bit for just specs like psi rating, temp, and fuel compatibility.

neither mention BD specifically but floroelastomer is the generic chemical name for viton.

http://www.hbdthermoid.com/automotive.htm

or this one -again scroll down for SAE30R9

http://cleanseal.com/hose.htm
-Noah

i deliver blends of biodiesel -no more!.

82 datsun 720 KC w/sd22
85 volvo 760gle sedan turbo diesel
85 peugeot 505s wagon turbo diesel & parts car
83 chevy k20 suburban silverado 6.2 n/a diesel

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asavage
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#32

Post by asavage » 13 years ago

http://www.gates.com/common/downloads/f ... psForm.pdf
December 2004
Form No.: 433-0780
Avoid comebacks, install permeation resistant fuel line hose

Fuel line hoses carry gasoline from the tank to the fuel pump, to the fuel filter, and to the fuel injection system. While much of the fuel lines are rigid tube, sections of it are made of rubber hose, which absorb engine and road vibrations.

There are two basic types of fuel hose: Fuel and oil hoses that meet the SAE 30R7 standard, and fuel injection hose that meets the requirements of SAE 30R9.

Standard fuel and oil (SAE 30R7) hose is rated for low pressure applications at 50 psi working pressure up to 3/8" size, and 35 psi for sizes over 3/8". This general purpose hose contains a light reinforcement, and the rubber materials can be any compound that is suitable for fuel, oil and vapors.

However, Gates Corporation engineers warn installers that fuel formulations at many US refineries are constantly changing as proprietary blends are introduced according to government mandates and seasonal influences. At times, more aggressive fuels can extract the oils that give SAE 30R7 hose its flexibility. The result is a brittle, stiff tube that will greatly reduce the performance and service life of the hose.

Fuel injection (SAE 30R9) hose or MPI (mult¡port injection) hose is reinforced to handle higher pressures up to 180 psi. It can be used on all injection systems that use hose clamps. It is not designed to replace coupled assemblies on fuel injection systems.

Fuel injection hose is designed for low permeation contact with a wide variety of alcohols, alcohol fuel blends, and diesel fuel. It allows 15g/m2/day permeation whereas standard SAE 30R7 hose allows 550g/m2/day. (Gates fuel injection hose routinely performs at 1 to 2g/m2/day of fuel loss, well below the allowable standard.)

Gates SAE 30R9 hose uses a laminated tube of Fluoroelastomer, as a thin wall inner layer backed by traditional compounds. This first layer protects the rest of the hose from attack, swelling or permeation from aromatics, oxidized gasoline (as can occur in fuel injection systems), ethanol or oxygenate additives and a wide range of petroleum based products.

The laminated tube will resist cracking caused by "sour gas," which forms when unused gas is returned to the fuel tank. As an added benefit, this hose construction reduces emissions because fuel can't evaporate through the hose walls.

SAE30R9 hose is also recommended for diesel fuel because its fluoroelastomer tube resists deterioration caused by some diesel fuel additives.

As refineries produce cleaner fuels and lower allowable permeation rates during the ``vehicle at rest'' condition, older hose specifications such as SAE 30R7 are becoming less reliable. This type of hose is no longer specified on OEM automotive fuel applications because of stringent permeation standards.

Therefore, Gates engineers assert that the best choice for automotive fuel line hose applications today is fuel injection SAE30R9 hose. For installers, it is the best choice for reduced comebacks and for high performance, assured trouble free service in a changing fuel environment.

Finally, for submersible applications such as on the in-tank fuel pump, only SAE30R10 hose should be used, because when the hose fails, the pump will fail. Hose construction consists of low swell fluoroelastomer compounds in the tube and cover that resist gasoline and diesel fuel permeation and aging. Standard hoses have these fuel resistant characteristics in the tube portion only.

Gates Corporation
PO Box 5887, Denver, Colorado 80217
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.

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asavage
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#33

Post by asavage » 13 years ago

[Extract from my original postings at biodieselnow.com]

I have read many people mention Gates 4219G (PDF here), which is described by Gates:

4219G meets SAE J30R7 (bio-diesel compatible)
=====================================================
http://www.gates.com/truckbus/popup/fuel_oil_GREEN.pdf
FUEL LINE APPLICATIONS (DIESEL/BIO-DIESEL)
Gates RLA, Fuel Line & Hi¡Temp Diesel Fuel Tubing
. RLA exceeds SAE J30R2 specification
. Fuel Line: Hi¡temp, permeation resistant and barrier construction hose
. Fuel line hose which meet & exceed SAE J1527 (USCG) specification
. Diesel fuel tubing which meet & exceed SAE J2260 specification
. Couplings: MegaCrimp (G series) & GLP

FUEL AND OIL HOSES
Molded and Straight Hoses for hydraulic and suction lines
. Temperature ratings up to 300°F
. 4219G meets SAE J30R7 (bio-diesel compatible)
. 4278CN meets SAE J30R7 (molded)
. 4219D meets SAE J30R9 (fuel injection systems)
. Couplings: PowerGrip SB Clamps

Gates TR500 Rubber Hose
. -40°F -- 250°F constant temperature rating
. 500 psi in sizes 4, 6, 8, 10, 12 & 16
. Crimped assembly meets SAE J1402 with DOT certification (replaces 100R5 hose), sizes 4, 6, 8, 10, 12 & 16
. True-Bore construction, wire reinforcement and textile cover
. Couplings: MegaCrimp« (G series) & GLP

The World's Most Trusted Name in Belts, Hose and Hydraulics

Gates Corporation
P.O. Box 5887
Denver, CO 80217-5887
800-777-6363
http://www.gates.com/truckandbus
=====================================================
treedweller wrote: Below is a reply from http://www.gates.com in response to my BD-compatibility query:
GRewerts wrote:Gates has tested fuel lines 4219G or 4219M with 100B biodiesel and has achieved good results. LOL+ is not a good fuel line for
biodiesel.

See attached data sheets.

Gary Rewerts
Hose Product Application
303-744-5070
There was a .pdf attached.
=====================================================
ftp://asavage.dyndns.org/biodiesel/Gates_4219G-M.pdf
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.

marvinlvyuan
Posts: 1
Joined: 7 years ago

viton tubing

#34

Post by marvinlvyuan » 7 years ago

you can review this site: http://www.cnviton.com
they sell viton tubing with different sizes, and the price is good.

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