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SVTPerformance's Chain of Restaurants
The Distillery
Return Guys: Fuel Pressure Drop when hot?
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<blockquote data-quote="MalcolmV8" data-source="post: 13717067" data-attributes="member: 8854"><p>Pressure should drop from vacuum to the regulator. Mine is set to a base of 39 PSI with pumps on and engine off. Or engine on and vacuum/boost hose removed from the regulator. When the hose is connected the engine vacuum causes fuel pressure to drop as it should. I forget exact numbers off the top of my head but an engine warmed and idling sees around mid to low 20s fuel pressure. Pull the vacuum line off and it jumps back to 39. This is normal operation. Remember the idea is to keep a pressure differential of 39 PSI across the injector which means if the manifold side goes into vacuum you need to lower the fuel pressure to keep that constant 39 PSI pressure differential across it. In boost fuel pressure should go up 1 PSI per additional lb of boost.</p><p></p><p>Also note 39 PSI is just the Ford default. You can adjust the tune for other differential pressures and then adjust your FPR accordingly but don't just pick a new pressure for your FPR without adjusting the tune to match.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 13717067, member: 8854"] Pressure should drop from vacuum to the regulator. Mine is set to a base of 39 PSI with pumps on and engine off. Or engine on and vacuum/boost hose removed from the regulator. When the hose is connected the engine vacuum causes fuel pressure to drop as it should. I forget exact numbers off the top of my head but an engine warmed and idling sees around mid to low 20s fuel pressure. Pull the vacuum line off and it jumps back to 39. This is normal operation. Remember the idea is to keep a pressure differential of 39 PSI across the injector which means if the manifold side goes into vacuum you need to lower the fuel pressure to keep that constant 39 PSI pressure differential across it. In boost fuel pressure should go up 1 PSI per additional lb of boost. Also note 39 PSI is just the Ford default. You can adjust the tune for other differential pressures and then adjust your FPR accordingly but don't just pick a new pressure for your FPR without adjusting the tune to match. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Distillery
Return Guys: Fuel Pressure Drop when hot?
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