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M35A3 fuel tank check valve/ commercial option?

guns1977

Member
105
20
18
Location
AL
My check valve is non functional, is there a commercial available option for one? I have done some searching but did not find a definate answer.
Thanks
 

doghead

4 Star General /Moderator
Staff member
Super Moderator
Steel Soldiers Supporter
26,247
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113
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What is the nsn? Either google it or look for it on parttarget to fin manufacturers.
 

guns1977

Member
105
20
18
Location
AL
4820014089958 is the nsn I could find. It says its 1/2 npft I was hoping to find a Napa or .... Cross number, they dont offer a fuel line check valve in a 1/2 thread size. That I could find
 

snowtrac nome

Well-known member
1,674
137
63
Location
western alaska
try a plumbing and heating store those are used in fuel fired boiler applications I could go to our local hardware store and get one right now for about 10 bucks.
 

Eliteweapons

Member
238
5
18
Location
Baltimore Maryland
I used this type. Mine had fallen apart so I replace it.

Compact Backflow-Prevention Valve


for Oil and Fuel, 1/2 NPT Female x 1/2 NPT Male







Each








In stock
$17.78 Each

7768K64






Valve FunctionBackflow Prevention
For Use WithDiesel Fuel, Gasoline, Oil
ActivationPressure Driven
Connection TypePipe × Pipe
ConnectionThreaded NPT Female Inlet × Threaded NPT Male Outlet
Pipe Size1/2 × 1/2
Maximum Pressure500 psi @ 70° F
Min Opening Pressure1 psi
Temperature Range-20° to 180° F
ShapeStraight
End-to-End Length2 1/8"
Mounting OrientationAny Position
Material
BodyBrass
SealFluoroelastomer
Valve TypeCheck
Check Valve TypeSpring Loaded
Flow Coefficient (Cv)2.4
Often installed in confined spaces, these valves have a shorter end-to-end length than standard backflow-prevention valves. They open to allow flow in one direction and close when flow stops or reverses.
 
Last edited:

1 Patriot-of-many

Well-known member
Steel Soldiers Supporter
2,155
63
48
Location
Zimmerman MN
I'll be ****ed an easy fix for once. Hadn't started my M35A3 in month or more, had one dead battery that wouldn't come back. Replaced it. Started truck up and it promptly died when trying the get the rpms up to inflate the tires...... Took the check valve off, filled it up with carb cleaner worked the ball, filled it the opposite way, let it sit and worked it, put it back on, started right up!!!!! Didn't even change the fuel filter, though I bought one and the water.fuel separator. Like McDonalds, I'm loving it!
 

tobyS

Well-known member
4,820
815
113
Location
IN
Don't forget to watch the pressure requirement to open the valve. It's pushing against a spring in most checks.
 
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