Checked my fuel pressure with a MAC Tools tester:

Engine off, pump on: 38 psi = OK (Bentley spec is 36 psi)
Engine running: 35 psi = Out of spec (Bentley spec is 29)
Engine running, fuel damper disconnect: 38 psi = OK (Bentley spec is 33 to 39 psi)
Engine off, after 20 minutes: 34 psi = OK (Bentley spec is 14.5 psi minimum)

I guess the 35 psi with the engine running implies the fuel damper is faulty? I triple checked the vacuum lines are connected and not leaking.

Tim

Tim,

That FP with engine running and Vacuum disconnected is a bit high at 35psi but the test with vacuum off is OK at 38PSI.

Here's my thoughts:
- Remove the vacuum line from the FP regulator and attach a vacuum gauge directly to the end of that line. What's it read?
- Then do same thing on the Fuel Damper vaccum line (Damper is at back of RHS fuel rail). What's it read? both should read the same.
- Then take another reading of vacuum at some other manifold point, like the line that feeds the Cruise Control module if you have the vacuum cruise module. What's that reading? All three readings should be the same.
- Next, connect a hand vacuum pump to the FP Req and apply vacuum you should be able to drop FP down to 2.0bar if you can't the FP Req is bad.

You need to figure out and fix the FP issue before you continue further. It could also simply be that for some reason the intake vacuum is low, like a leak or cams that are not properly timed?

Get us you manifold vacuum number at idle, if I recall you need like 50-60kPa of vacuum. That's in the -7.5PSI range or -0.5bar

If you have cams with a lot of overlap or they are out of time you can easily see low intake vacuum at idle. So in neutral rev the engine up to say 2000RPMs does the vacuum change?

When doing the fuel pressure tests, I discovered that the vacuum line for the fuel pressure regulator was hooked up to the temperature switch on the throttle body. The correct location is below the throttle plate as shown in this pict.
[IMG]http://i1349.photobucket.com/albums/...ps2d04a8c3.jpg[/IMG]

- Remove the vacuum line from the FP regulator and attach a vacuum gauge directly to the end of that line. What's it read? 3 psi
- Do the same thing on the Fuel Damper vacuum line. What's it read? both should read the same. 3 psi
- Take another reading of vacuum at some other manifold point. What's that reading? All three readings should be the same. I used the power brake line and got 3 psi. Yes, they are all the same.
- Next, connect a hand vacuum pump to the FP Req and apply vacuum you should be able to drop FP down to 2.0bar if you can't the FP Req is bad. 5 psi of vacuum op press regulator causes 5 psi drop in fuel pressure. Conclusion press regulator is good.
- Get us you manifold vacuum number at idle, if I recall you need like 50-60kPa of vacuum. That's in the -7.5PSI range or -0.5bar I assume this is the same pressure I measured at all three locations (3 psi)
- Rev the engine up to say 2000 RPMs does the vacuum change? Yes.. At 2,000 RPMs, I get 6 psi of vacuum and fuel pressure is about 32 psi.

Based on these tests, I conclude my fuel deliver system operates correctly. So the question is: Is the my low manifold pressure a by-product of my GT2 cams or bad cam timing?

So I agree that your regulator seems fine. But at idle your manifold vacuum is low at -3PSI not sure why that is maybe someone else can help?

Sad day,

My transmission locked up (can't get it out of 5th). I changed my transmission oil this weekend because of strange whirring sounds. This is what the bottom of the pan looked like:

[IMG]http://i1349.photobucket.com/albums/...ps8d989142.jpg[/IMG]

So, I knew that it was dying.

Just when I was finally getting the engine sorted--Thanks to Sal Carceller. AFRs were around 13.0 under WOT and 14.7 at idle. I imagine it will take awhile to get back on the road.

Sad, sad day.

Tim, this really sucks! I feel for you, stuck in 5th gear is bad.
I'm not a trans expert maybe others can chime in on those particles in the pan? Any large chunks of metal? or just small flecks?

G50 or 915? Hear you can pick up 915's relatively cheap, but G50's are pricey.

It's only a half days work to swap one out.

No large chunks of metal. Just metallic flakes.

It is a 915. Any suggestions on where to get one? I bought this one rebuilt from Vertex about 10 years and 25,000 miles ago.

Tim

I've used Gary Fairbanks over the years.

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/645256-gary-fairbanks-norwalk-ct-awesome.html

Let me know if Gary is still doing transmissions. I spoke to him earlier in the year and he said he was cutting way back on what he did, walk in traffic only and not all of that. I gather the guy is in his '70's and tapering off.....but I note he has an ad in Panorama each month, so perhaps things have changed for him?

Dennis