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Where to put needle valve for fuel pressure gauge?
Old 03-02-2010, 04:45 PM   #1 (permalink)
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Join Date: Apr 2006
Location: 6 miles from Solon, IA
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Question Where to put needle valve for fuel pressure gauge?

It is always recommended here that a needle valve be installed in the hose going to the fuel pressure sender to protect that expensive sender from pressure pulses. OK, that makes sense.

My question is: Where should it go?

I am planning on drilling and tapping my banjo bolt unless there is a better option. I will use a 1/8" npt tap, which is the same thread the Autometer fuel pressure sending unit uses. I am planning to mount the sender away from the engine using either a grease gun hose or braided stainless hose.

Just finding a 1/8" needle valve has proven challenging locally. All I can find are 1/8" npt (good) to 1/8" compression (bad). But I have located the right types (1/8" npt on both ends) online and need to figure out which to order, female-to-female or female-to-male), which in turn is dependent upon where I place the needle valve:

If I mount the needle valve directly to the tapped hole in the banjo bolt, I need a 1/8" male to 1/8" female needle valve. The grease gun/braided SS hose would screw directly into it and would need a female/female coupler at the other end where the sender would screw on.

If I mount the hose, which has 1/8" npt threads already, directly to the tapped hole in the banjo bolt, I could use a 1/8" female to 1/8" female needle valve right at the sender and no other coupler would be needed if I use grease gun hose which already has 1/8" male fittings at both ends. If I use braided SS hose, which I can get with 1/8" male on one end and AN-3 or AN-4 at the other end, it would require an adapter back to 1/8" npt.

Is there any advantage to mounting the needle valve either before or after the hose?
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