need more fuel

[dzorde]

Thanks for all the answers and help.  I now have access to a dyno and will
proceed along the following line:

1. Check if fuel pressure stays steady when injectors are maxed out, if so
fuel pump flow OK.
2. Clamp return line to increase fuel pressure to see if fuel pump can
supply required pressure and flow to fix problem.
3. If point 2 worked then shim regulator to get same pressure and problem fixed.
4. If point 2 did not work, then price another set of injectors Vs a larger
fuel pump and increase fuel pressure, problem fixed.  At this point in time
the fuel pump looks to be a cheaper option.

Thanks again

Dan     dzorde at geocities.com 

>You can calculate shim thickness with good results like this:
>1. measure present fuel pressure
>2. disassemble regulator
>3. measure free length of spring
>4. measure compressed length of spring by measuring spring space in
>housing
>5. SpringRate = fuel pressure/(free length - compressed length)*
>6. shim thickness = (desired fuel pressure - present fuel
>pressure)/spring rate
>
>In my case ordinary galvanized roof flashing with .015 thickness
>produced 5psi increase exactly as predicted. Be very careful
>re-assembling the regulator. The screws will try to grab the diaphragm
>and twist it and apparently no one sells the diaphragms separately.
>
>* I know, actually this isn't the spring rate but it is related and it
>is the number you need here.
>-- 
>Robert W. Hughes (Bob)
>BackYard Engineering
>Houston, Texas
>rwhughe at hal-pc.org
>