99 Cadillac Escalade Q?
 

it has the 5.7l engine, where is the fuel pressure regulator located?

Should be in the rails.....passenger side I believe on the front of the rail

no rails, it's the old 5.7

You're not going to like the answer... but the Fuel Pressure Regulator is attached to the Fuel Metering body opposite the fuel lines. Meaning its INSIDE the intake. And to get to the fuel metering body requires removing the upper radiator hose and intake and all those little annoying hoses and bolts to boot.

It's inside of the intake manifold on the passenger side of the SCPI assembly. To get to it you must remove the upper half of the intake manifold.

You can see it here:
http://bertok.us/pics/cpi3.jpg

Erm...OK ??

I thought the old school 5.7 Vortec was still port injected like the LT1....see what I get for thinking


At least you got your answer though.....

:bang: :bang:

oh this sucks! thats what I get for helping someone out :bang:

Good luck grippy.......don't call me if you need help ;)

All the Gen-Ie Vortec engine had CPI or SCPI injection. The fuel goes into a central assembly where all 6 or 8 injectors are housed. From there the injectors feed individual tubes with poppet valves on the ends to each port. The biggest proplem is that the poppet valves have proven to be incompatible with certain fuel additives and can stick open or closed. GM's resolution was to release a retro-fit assembly that has individual tiny multec-II injectors at the ends of the spider tubes. This is a vast improvement but still limited and non-upgradable in flow.

http://bertok.us/pics/l31-scpi-mpfi.jpg

The injection in these engines has always been the single limiting factor in making big power. (Look at all the trash inside air has to get around. Combined with the weak valvesprings it's no wonder they don't breath past 4800RPM!)

http://bertok.us/pics/mpfi-installed.jpg

I only just recently rid my truck of the SCPI disaster:

http://bertok.us/pics/L31Marine/Inst...n/both-top.jpg
http://bertok.us/pics/L31Marine/Inst.../both-rear.jpg

Now running 36# injectors instead of stuck with 19#.

Does this regulator need to be replaced?

I could suggest replacing the whole thing with the upgrade unit.

Part Number 93441235.

It includes the complete assembly, 8 injectors, new regulator, new o-rings, and is ready to install. These things are not very expensive and will help the truck pass emission and idle smoother.

Those of us who have done it have found it necessary to shim the support bracket to bring the assembly to the proper height. Also, lube the o-ring seal around the unit and the inside of the upper manifold with grease to help get the top back on. It's tight.