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 problem

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Old 07-09-2007, 01:40 PM
  #1  
green95GT
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Default fuel problem

ok so lately it has been starting hard have to turn it over alot. so this morning i checked the fuel pressure none. would that be my fuel pump or regulator or something else. thx
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Old 07-09-2007, 02:13 PM
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samseed101
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Default RE: fuel problem

Could be pump, could be regulator, could be ruptured or damaged line, etc. How are you checking the fuel pressure? Did you check it with the key in the "on" position? Try turning the key to the "on" position. When you do, do you hear the pump engage for a second and then stop?

If you have a spare regulator or access to one (even if you borrow one from a friend) then I would just quickly swap them out to see if there's a difference. Normally I'd say to remove the vacuum line and look for evidence of fuel in the line. But since it takes less than 5 minutes to swap out a regulator, then I'd much rather just do that.
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Old 07-09-2007, 02:22 PM
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dimebag
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Default RE: fuel problem

samseed is on the right track for sure... listen to him

just check everything in the fuel system, its not like its a big system or anything. here...

koeo- do you hear the fuel pump prime?
when was the last time u changed the filter?
get up under that bitch and look at ur fuel lines
does the car run at all? start it up, then pull the vac line off the fpr, idle should rise a little
where are you checking fuel press? schrader valve i assume?
lastly try clamping off the return line, and keep priming the pump... pressure should build, telling you if ur pump is good or not

let us know how it works out
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Old 07-09-2007, 03:25 PM
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94Blk5.0
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Default RE: fuel problem

I would start with the simple $10 fuel filter. People tend to forget about them.
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Old 07-09-2007, 04:10 PM
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green95GT
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Default RE: fuel problem

yes i hear the fuel pump prime. it starts after about eight times turning it over. if i prime the pumb about 5-6 times then it starts fine. i checked the pressure schrader valve. if i keeping priming the pumb i get pressure. but when it sits for awhile it doesn't
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Old 07-09-2007, 05:53 PM
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samseed101
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Default RE: fuel problem

So check the regulator. Either test it or swap it out with a known good regulator. I still say to just take the 5 min and swap it out.
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