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Injector will not make the fuel pressure drop when it is running.
 

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You have a fuel pressure problem. Could be a restriction, regulator or pump. You said the pump only dead headed about 40psi? my guess would be the pump.
 

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You have a fuel pressure problem. Could be a restriction, regulator or pump. You said the pump only dead headed about 40psi? my guess would be the pump.
what do you mean by restriction?
A restriction of fuel getting to the pump. (i.e. fuel filter or screen in fuel pump, closed off petcock, etc.)If the pump doesn't have the proper supply of fuel to it, It can't create the flow it need to provide the pressure required.
 

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Discussion Starter #29
You have a fuel pressure problem. Could be a restriction, regulator or pump. You said the pump only dead headed about 40psi? my guess would be the pump.
what do you mean by restriction?
A restriction of fuel getting to the pump. (i.e. fuel filter or screen in fuel pump, closed off petcock, etc.)If the pump doesn't have the proper supply of fuel to it, It can't create the flow it need to provide the pressure required.
welp I changed the fuel pump, fuel regulator, fuel filter and the same stuff I’m completely baffled lol. I have no clue now
 

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what do you mean by restriction?
A restriction of fuel getting to the pump. (i.e. fuel filter or screen in fuel pump, closed off petcock, etc.)If the pump doesn't have the proper supply of fuel to it, It can't create the flow it need to provide the pressure required.
welp I changed the fuel pump, fuel regulator, fuel filter and the same stuff I’m completely baffled lol. I have no clue now
You put all those new parts on and still only have 40 psi when deadheaded?
 

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Discussion Starter #31
what do you mean by restriction?
A restriction of fuel getting to the pump. (i.e. fuel filter or screen in fuel pump, closed off petcock, etc.)If the pump doesn't have the proper supply of fuel to it, It can't create the flow it need to provide the pressure required.
welp I changed the fuel pump, fuel regulator, fuel filter and the same stuff I’m completely baffled lol. I have no clue now
You put all those new parts on and still only have 40 psi when deadheaded?
dead headed meaning just testing the fuel pump? And no I haven’t checked the psi yet it’s still missing at high revs is what I was meaning to say
 

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Discussion Starter #32
what do you mean by restriction?
A restriction of fuel getting to the pump. (i.e. fuel filter or screen in fuel pump, closed off petcock, etc.)If the pump doesn't have the proper supply of fuel to it, It can't create the flow it need to provide the pressure required.
welp I changed the fuel pump, fuel regulator, fuel filter and the same stuff I’m completely baffled lol. I have no clue now
You put all those new parts on and still only have 40 psi when deadheaded?
dead headed meaning just testing the fuel pump? And no I haven’t checked the psi yet it’s still missing at high revs is what I was meaning to say
tested it and it was worse than the other pump
 

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That will do it, the FI light should of been flashing.
 
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