Fuel Pressure Testing - 5ktq - where to tap?

[Ben Swann]

I have been trying to track down the cause of poor cold start problem, and
warm start after sitting for some minutes is not great either.  It seems I
have a fuel pressure problem, which may have been stirred up when I removed
the CIS assembly to pull the engine.

I have already replaced 2 of 3 o-rings in the system pressure regulator(aka
push valve or pressure relief valve).  Couldn't get the outer o-ring
without completely dissasembling.

Anyway, I think I need to run pressure tests to isolate the culprit.

Question:  Where is the best/proper place to insert my guages.  I am using
manifold/AC guages with inline fitting adaptors.

1) There is a fitting to the cold-start injector - probably the easiest to
tap, but I think I could only get system pressure here.

2) There is a fitting beneath the fender - I used this before, but looking
at it again, it goes to a solenoid beneath the fender(what is it?), so I
think my prior tests were bogus.

3) the fitting on top of the metering head /fuel distributor which comes
from the control pressure regulator is a banjo fitting, so I can not
readily use my guages without some special adaptor.

I plan to check the airflow sensor plate rest position and thermo-time
switch prior to running pressure tests.  Is the thermo-time switch located
in the coolant fitting on the head?

Any other advice to resolve this problem is appreciated.

TIA

Ben

'87 5000 tqa Pearl - Engine rebuilt and running...Elgin 270i260e cam,
lifters &
techtonics springs, new rings and bearings, seals.  T03/K26 hybrid turbo,
2-Piece Exhaust manifold, highflow cat and 2.5" Stebro exhaust.  Bypass
valve and supplimentary fuel injector installed(but not connected to fuel
yet) in intercooler. 200 Flywheel, Clutch and Pressure plate.  Using
existing QLCC chip & Schrapnel Knob for control - set for 1.7 bar max
during break-in.