Pressure regulator
Thread Starter
Racer
Joined: Jun 2012
Posts: 325
Likes: 36
From: Colorado Springs Colorado
Pressure regulator
I am working on my throttle bodies/injectors 84 Vette, took everything apart including the pressure regulator, now the service manual says not to remove the cover of the regulator since it is adjusted at the factory. I seen a rebuild kit( basically just a couple of diaphragm gaskets) sold everywhere, if the regulator is not supposed to be serviced, why are the kits sold? Since I already have it apart, how do I know if it is set correctly? I saw the screw that you can turn up or down, I think it is in the same position as found. The manual does not say how to adjust if you take it apart, anybody with the same experience?
Melting Slicks
Joined: Jan 2014
Posts: 2,192
Likes: 381
From: Lunenburg MA
There are lots of things not designed to be fixed that can be. You can put it back together, hope it doesn't leak, and check the pressure with a gauge. But since you've gone this far as might as well get an adjustable one (externally adjustable).
Thread Starter
Racer
Joined: Jun 2012
Posts: 325
Likes: 36
From: Colorado Springs Colorado
I saw a guy on YouTube installing an adjustable one on a twin throttle body from a truck, it looked simple enough. I installed a 1985 pump, what is the preferred pressure?
Pro
Joined: Jan 2003
Posts: 706
Likes: 47
From: Denver Colorado
You want 13 psi to the injectors. If you have a stock 84 fuel pump this may be hard to get. A lot of folks run 85 or later C4 pumps to get this pressure. If you do not mess with the adjustment screw, you will likely be close to 12-13 psi just by reassembling it. There is a knock out in the bottom of the fuel pressure regulator housing that must come out to adjust the regulator. Without a special tool, you must remove the TBIs each time you make an adjustment, its another trial & error procedure but, the Cross-Fire is VERY sensitive to fuel pressure and getting it right is worth the effort.
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
There's so many good reads that might be interesting. I don't believe I'd rush into it and if you're serious about the Cross-Fire I'd maybe chase some of the tools, consider the construction of the TB to TB pipe with a Silver Soldered fitting for a gauge maybe.
Read, read and then some more and maybe create a list of questions that could be maybe addressed individually. I had a couple friends with Cross-Fire years ago and both of were modded a good bit. I didn't participate but remember both were pretty happy at the time.
Read, read and then some more and maybe create a list of questions that could be maybe addressed individually. I had a couple friends with Cross-Fire years ago and both of were modded a good bit. I didn't participate but remember both were pretty happy at the time.
Thread Starter
Racer
Joined: Jun 2012
Posts: 325
Likes: 36
From: Colorado Springs Colorado
You want 13 psi to the injectors. If you have a stock 84 fuel pump this may be hard to get. A lot of folks run 85 or later C4 pumps to get this pressure. If you do not mess with the adjustment screw, you will likely be close to 12-13 psi just by reassembling it. There is a knock out in the bottom of the fuel pressure regulator housing that must come out to adjust the regulator. Without a special tool, you must remove the TBIs each time you make an adjustment, its another trial & error procedure but, the Cross-Fire is VERY sensitive to fuel pressure and getting it right is worth the effort.
Pro
Joined: Jan 2003
Posts: 706
Likes: 47
From: Denver Colorado
We are actually pretty close and I have the gauge and tool from when I owned the '84. I'm west of Denver
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