Fuel Pressure Regulator - Bonehead Question...

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-nick
MegaSquirt Newbie
Posts: 11
Joined: Tue Oct 12, 2004 10:09 am
Location: Cambridge/Boston, MA

Fuel Pressure Regulator - Bonehead Question...

Post by -nick »

So picked up a cheapy adjustable fuel pressure regulator-

Image

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
1980 924TurboS
Bernard Fife
Super Squirter
Posts: 1009
Joined: Mon Feb 16, 2004 3:15 pm

Post by Bernard Fife »

~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.
-nick
MegaSquirt Newbie
Posts: 11
Joined: Tue Oct 12, 2004 10:09 am
Location: Cambridge/Boston, MA

Post by -nick »

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
1980 924TurboS
PSIG
Experienced Squirter
Posts: 201
Joined: Fri Jun 11, 2004 11:02 pm
Location: Poulsbo, WA

Post by PSIG »

-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.
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