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Hi could you help need to find out what thread and the size of the unions used from the fuel pump to the carb on a m38. Thanks

The lines are 1/4" steel with inverted flare fittings, the elbows are 1/8" Pipe to 1/4" inverted flare... available at NAPA...

Thanks for the info. are the threads unf?.

I am not sure about that, they are standard here in the US...

Not so lucky over here most of ours are metric. can order them in from local spares shop but needed to make sure i was ordering the correct threads. Thanks

The pipe thread ends will be NPT. (national pipe tapered)

Thank you just what i needed. All the best

The elbows are NPT on the end that threads into the pump or the carb. The inverted fitting end that the tubing threads into is UNF.

Tube
O.D. Thread
1/8 5/16-28
3/16 3/8-24
1/4 7/16-24
5/16 1/2-20
3/8 5/8-18
7/16 11/16-18
1/2 3/4-18
5/8 7/8-18
3/4 1 1/16-16
7/8 1 3/16-16
1" 1 5/16-16

Inverted Flare
• Typical Application
Hydraulic brake, power steering, fuel lines and transmission cooler lines,
LP and natural gas (special order).
• Pressure
Working pressure up to 2000 psi depending on tube size. Will withstand
burst pressure of standard tubing - up to 5000 psi with bundy-weld (double
flared) and 3500 psi with copper tubing, depending on size.
• Vibration
Excellent resistance.
• Temperature Range
-65°F to +250°F (-53°C to +121°C) range at maximum operating pressures.
• Material
CA360 Brass.
• Used With
Copper, brass, aluminum and steel hydraulic tubing that can be flared. See
page 28-32 for material compatibility.
• Advantages
Very low cost and reusable. Seats and threads are internal and protected.
Compact, excellent vibration life. Short nut affords very close tube bends. Steel or brass tube nut.
• Conformance
Listed by Underwriter’s Laboratories (available on special order) for fuel
equipment, refrigeration and gas. Meets specifications and standards of ASA, ASME, SAE and MS (Military Standards).
• How to Order
Order individually by catalog number.
• NOTE:
Refer to current price list for availability of cataloged items. Configurations and dimensions subject to change without notice. Additional information can be found
in SAE J512.
• Assembly Instructions
1. Cut tubing to desired length. Make sure all burrs are removed and the ends are cut square.
2. Slide nut on tube. Threaded end “A” of nut must face out.
3. Flare end of tube with a 45° flaring tool. See page 26 for flare data.
a. Measure flare diameter.
b. Examine flare for excessive thin out.
c. On thin wall, welded or brazed tubing, use double flare to prevent pinch-off and cracked flares.
4. Lubricate threads and assemble to fitting body. Nut should be turned hand tight.
5. Tighten assembly with a wrench until a solid feeling is encountered. From that point, apply a one-sixth turn.
NOTE: Do not over-torque as it may damage the fittings or split the tubing at the flare.
Label Set: W-8022 (adhesive)
CL-490 (non-adhesive)
Refer to safety information regarding proper selection of tubing and tube fittings on page 1.
gs

Thanks again Wesk.