5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Fuel pressure drops need help

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Old 02-07-2006, 01:55 AM
  #11  
grabbem88
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Default RE: Fuel pressure drops need help

like i said vac will be different under different engine loads...unplug it and see if it drops.
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Old 02-07-2006, 02:01 AM
  #12  
philly3384
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Default RE: Fuel pressure drops need help

when i unplug the line the pressure goes up and holds there but never reved the car with the line off dont know what would happen lol
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Old 02-07-2006, 02:04 AM
  #13  
grabbem88
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Default RE: Fuel pressure drops need help

it will run very rich,and or idle higher than normal...it won't hurt it,just make sure you rehook it....
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Old 02-07-2006, 02:13 AM
  #14  
philly3384
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Default RE: Fuel pressure drops need help

S351 how do u do all those things that u described just asking cuz i want to make sure i do it right especially when messing around with fuel.
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Old 02-07-2006, 02:21 AM
  #15  
grabbem88
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Default RE: Fuel pressure drops need help

i'll answer that,cause iv'e been through the same ****...which turned out to be a 6mo. fuel pump).
disconnect innertia switch, start it till all fuel has been depleted..or dies..unhook lines from the front,and back to tank..you can disconnect battery if you want to be safe..then just blow them out...checking voltage is done with a meter...i had to drop my tank,cause i couldn't get to the plugs ins.
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Old 02-07-2006, 03:03 AM
  #16  
schwindty
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Default RE: Fuel pressure drops need help

Hey Grabbem what were the simptoms of the inertia swtich failing? What kinda pump were ya running? N ****
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Old 02-07-2006, 04:22 AM
  #17  
grabbem88
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Default RE: Fuel pressure drops need help

sometimes it gets shorted...atleast on some hatches..bad seal water leaking in...i never seen it happen though..
it was a walbro(like all aftermarkets) now it's a holley...my fuel gauge didn't work so i ran it low everytime..
kinda burn't it up
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