Attention: TDR Forum Junkies 
Is anyone using the Moroso pump spring (part#65770) in there Holley Blue and getting less pressure than with the stock spring? I made a last ditch effort to get the pumps pressure back up 15 psi but to my surprise with this new spring installed I'm actually seeing less 
The stock spring has been stretched and for about 3 months I was seeing 15. 2 at idle and 14. 2 at cruise. Currently I'm seeing anywhere from 14. 2-12. 2 at idle and 10. 2 at cruise. What I don't understand is when I start to roll into the throttle pressures will actually increase, sometimes up to 13 psi, but as soon as I let off the gas it'll drop down to as little as 9 PSI.
Thinking my stretched spring was the possible culprit I bought the Moroso spring. The first thing that caught my eye is this spring is less than half the length of the stocker. When removing the stock spring you really have to hold onto the screw because of the pressure the spring has on it. Putting the new spring in... ... . no resistance what so ever when I put the screw back in. Start the truck up and only seeing about 9. 5-10. 2 at idle, confused and a little po'd I didn't even take it for a drive
Does this Moroso also need stretched or is the Blue just destined for the bone yard?
The stock spring has been stretched and for about 3 months I was seeing 15. 2 at idle and 14. 2 at cruise. Currently I'm seeing anywhere from 14. 2-12. 2 at idle and 10. 2 at cruise. What I don't understand is when I start to roll into the throttle pressures will actually increase, sometimes up to 13 psi, but as soon as I let off the gas it'll drop down to as little as 9 PSI.
Thinking my stretched spring was the possible culprit I bought the Moroso spring. The first thing that caught my eye is this spring is less than half the length of the stocker. When removing the stock spring you really have to hold onto the screw because of the pressure the spring has on it. Putting the new spring in... ... . no resistance what so ever when I put the screw back in. Start the truck up and only seeing about 9. 5-10. 2 at idle, confused and a little po'd I didn't even take it for a drive
Does this Moroso also need stretched or is the Blue just destined for the bone yard?
The Moroso spring should have raised the pressure quite a bit. Try taking the bottom off the pump and see if any of the vanes on the rotor are hanging up. 
