Quote:
Originally Posted by 47dodge
I checked the fuel pressure on my 240 before changing the pump spring, and it was about 10 psi. After changing the pump spring I did stretch the relief spring checking it with a gauge to see what I was doing. 21 psi under load now. I do not see a need for an electric pump in addition to the lift pump. The lift pump seems to hold pressure just fine. As Forced has said one or the other.
For the gauge I drilled and tapped the banjo bolt that the fuel enters the IP. 1/8 pipe thread is the size I used. Make real sure no filling/chips etc are left in it. Of course do this off the car. I really would not do anything without starting with a gauge.
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If you could mention any observabe changes at the higher pressure over the old pressure. It would be helpful to others. Especially since yours is the 616 or four cylinder engine. I know for sure myself and a few others are always interested in what transpired.
If you are on vegatable oil of course any sensations of changes are reduced. Funola made me suspect that much higher pressure increased his milage substantially on wvo to diesel fuel levels.
Before that we always thought it was just a fact that wvo burners got less mpg but since the fuel was cheap it really was not too important. If it actually contributed to increased mpg my further suspicion is it made a better cleaner burn. That of course is going to make burning wvo less damaging to the engine as well.
Funola was operating at about thirty pounds pressure in the injection pump base to enable this. Because the wvo has far more viscosity than diesel fuel. At that elevated pressure I fell it does not get the injection pump profile or calibration into a new area.
. On thinner diesel too much pressure can in my opinion change the injection pumps running calibration. Nineteen to twenty pounds should be fine for diesel.