Fuel injectors or damper?

Discussion in 'General Automotive Tech' started by escortwgn, Mar 26, 2022.

  1. escortwgn

    escortwgn Active Member

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    Ok. So you weren’t kidding on how fast pressure can build. 2 second fuel cycle…….78psi! But in 30 mins it went from 78 to 59psi. One extremely small leak on the inlet to rail. Cannot see any leaks on the rail itself feeding injectors. All other joints are dry.
     
  2. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    Can you get a replacement rail, new or used?
     
  3. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    I may or may not have a spare rail, I'll have to go look.
     
  4. escortwgn

    escortwgn Active Member

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    That’s the joint. I may not of used the correct words to describe
     

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  5. escortwgn

    escortwgn Active Member

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    Repairing the connection, but noticed the return line it still pressurized. So regulator is working properly then?
     
  6. escortwgn

    escortwgn Active Member

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    Fuel line repaired. Did the test again, but with the return plugged in. No visible leaks. In 30 mins time: 37psi to 30psi
     
  7. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    Yes! And that was the inlet hose to the rail's quick disconnect. NAPA sells new ones that are properly put together; those nylon lines are supposed to be heated before going over the barb, but if too heated, the nylon fails to shrinky-dink when cooled.
     
  8. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    Of course, '86 or newer, as the connection down at the frame rail's the same as the factory CFI, IIRC.
     
  9. escortwgn

    escortwgn Active Member

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    Made a few of those connections. And dealt with the overheating. Think that joint was it. But had enough hose to cut and redo. But added a hose clamp just to be sure.

    just took around the block. Ran good. Still got gauge on. I’ll give it a few hours and read it. But does the second 30 minute reading look good tho?
     
  10. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    Yes, as long as it held 30PSI after that for a while. The pressure reading isn't as important as keeping the measure of fuel inside the lines and rail, so pressure will jump to spec on initial prime.
     
  11. escortwgn

    escortwgn Active Member

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    Ok. Fingers crossed thanks for everything so far!
     
  12. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    You're quite welcome, I'm glad I could help.
     
  13. escortwgn

    escortwgn Active Member

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    Overnight update. Gauge zeroed out over night. I turned key to on to let pump cycle, then cranked. It stumbled a bit and fired. Thoughts?
     
  14. Silvertwinkiehobo

    Silvertwinkiehobo "Nothing is foolproof as fools are ingenious."

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    It's still losing pressure, which it will eventually do, but it's either 1) also losing fuel, which causes the 'dead spot,' or 2) you could be cranking the engine upon initial key-turn, when you should wait for the 2 second cycle before cranking, which is what I do.
     
  15. escortwgn

    escortwgn Active Member

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    I did let it do the fuel pump cycle prior to cranking today. I’ve looked at all the connections, and not a one is wet from sitting. I’m hesitant on removing upper intake, but that’s truly the only spot on the fuel system I cannot see clearly.
     

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