The proper place for the pressure gauge is between the fuel pump and the
pressure regulator. The only thing 'after' the pressure regulator is the
return line to the tank and that will have close to zero pressure.

The fuel comes from the pump to a "T" connector near the distributor.
 From there it branches off with one leg to the left head and one to the
right. At each head is a "cigar tube" where the 2 injectors connect on
each side. The fuel goes in one end of the tube and out the other. Both
outputs return to the center of the engine where the pressure regulator
is. Each line connects to one of 2 pipes on the regulator high pressure
side. The regulator  constantly bleeds fuel pressure out  into the
return line to the tank.  By this method the fuel pressure is the same
all the way from the pump output to the regulator. The pump is always
trying to put out more pressure than the regulator will allow. There is
thus always fuel being returned to the tank from the regulator pressure
relief mechanism.

Mark

Craig Oda wrote:

>Todd,
>
>
>good point.  I'll put the fuel pressure gauge after the pressure
>regulator.  You're right.  I need to get the same pressure that is
>going to injectors, especially since I suspect that the pressure
>regulator might be flaky.
>
>Regards,
>Craig
>
>
>On Sun, 20 Jun 2004 11:02:57 -0700, Todd Last <rubatoguy@comcast.net> wrote:
>
>
>>I would think that they would be fine assuming that they are accurate.
>>It would be interesting to test them alongside an "expensive" gauge to
>>see if there is any difference.
>>One thing I have noticed in less accurate gauges is that they play with
>>the dial scale and pointer width to conceal the margin of error.
>>
>>In anycase, I'm wondering if  a better placement for the fuel pressure
>>gauge would  be AFTER the fuel pressure regulator.
>>If you put it right after the fuel pump, you'd only see the delivered
>>pressure from the pump, not the actual pressure the injectors are seeing.
>>right?  And you never want to use a mechanical pressure gauge in the
>>passenger compartment for fuel pressure. (because of what would happen
>>if it leaked)
>>
>>