need fuel

[peter paul fenske]

Hi Dan

Oh yes almost forgot. When on a dyno at WOT plumb the 
fuel return line to a bucket. If there is no fuel returning
you ain't got enough

Es old buick GN trick. Just have lots of fire extinguishers
handy.

Peter

At 05:55 PM 3/23/98 -0800, you wrote:
>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
>>
>
>
>