Quote:
Originally Posted by 311evo
This.
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The symptoms are:
1) Run Bosch off of car's relay and it works fine up to current power level, car will hit 68psi as you'd expect with 25psi boost and 43 base.
2) Run pump off of car battery (using a relay) and it'll max at 55-60psi.
3) Run pump on BAP on the car or battery and it maxes in the low 50's psi.
The car's relay runs it at 9volts or so in low load situations so I'm guessing that the hotter the pump gets (from voltage) the worse that it works.
I've pondered it being a boost issue with the vacuum line to the fpr, but it works in the #1 configuration so that would seem to rule it out.