MicroSquirt.com read only forum (Jan.15,2018)

So picked up a cheapy adjustable fuel pressure regulator-



Question is - which port is the inlet and which is the outlet?! I mounted it so that the inlet was a side port, and the outlet the bottom port. However, on a quick test I could only get the pressure to drop down to 2bar by unscrewing the adjustment screw almost completely out.

Is there a way to figure out the in and out?

cheers!
nick

~nick,

It looks like the regulator's internal spring acts against the nipple that points up and to the right in your photo. The would make the nipple that points down and to the right the outlet. I think this is the way you have it.

Lance.

That's what I've seen, although intuition was making me think fuel would push up from the bottom against the spring and bleed off - which is apparently incorrect!

Anyway, I ended up discovering that my fuel system is leak-free at least up to 75psi b

nick

-nick wrote:Is there a way to figure out the in and out?

Another way of looking at it is that the pressure gauge will be on the high pressure inlet side of the valve and the other nipple will be the low pressure outlet. FYI - even the Bosch regulators adjust down to about 2 bar minimum. You may be able to replace the primary pressure spring with a lighter part since it appears to be screwed together.