Go Back   Ford Mustang Forums > Mustang > 5.0 Mustang > 5.0L Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

5.0 Mustangs Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


Reply   Post New Thread
Unread 05-26-2008   #1 (permalink)
primer gt is offline Apprentice

5.0L Member


Joined: May 2008
Posts: 75 Threads: 13
 primer gt's Country Flag
Phoenix   Arizona
primer gt is on a distinguished road
Default how do you tell if your fuel pump is going bad

Well that bad stutter my car is having is driving me nuts tested my car fuel pressure today(88 5.0) 35 steady at idle and max it peaks at 44 and when i unplug the regulator it stays at 44

the second that i shut my car off it goes to 0
and with just key on car off pump kicks on for a few seconds (44psi) pump will shut off and pressure goes right to 0psi
primer gt is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Unread 05-26-2008   #2 (permalink)
EagleAutosports is offline SHELBY GT-40 ULTIMATE Member

4.6L Member
5.0L Member


Joined: Feb 2007
Posts: 51,471 Threads: 257
 EagleAutosports's Country Flag  View EagleAutosports's 548 photos  View EagleAutosports's 3 classified ads  View EagleAutosports's HomePage
Graham   North Carolina
EagleAutosports is on a distinguished road
Send a message via MSN to EagleAutosports Send a message via Yahoo to EagleAutosports
Default

That sounds more like the regulator to me.
__________________
AFM Site Administrator
Member: Mustang Club of America #82740, White Mustang Registry #362, NMRA, Fun Ford Weekend, Mustangs of Burlington

MOOG Certified Technician
For mods and sound clips, see profile and gallery.

EagleAutosports is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-26-2008   #3 (permalink)
primer gt is offline Apprentice

5.0L Member


Joined: May 2008
Posts: 75 Threads: 13
 primer gt's Country Flag
Phoenix   Arizona
primer gt is on a distinguished road
Default

so if the manual say it should be 40-55 should i get a full 55 cause the manual says low pressure is leak or pump and high pressure is pinched line or regulator
primer gt is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-27-2008   #4 (permalink)
Cobrajet67 is offline PONY Member

5.0L Member


Joined: May 2008
Posts: 784 Threads: 12
 Cobrajet67's Country Flag  View Cobrajet67's 6 photos
Oxford   New Jersey
Cobrajet67 is on a distinguished road
Default

also try changing your fuel filter
Cobrajet67 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-27-2008   #5 (permalink)
Cobrajet67 is offline PONY Member

5.0L Member


Joined: May 2008
Posts: 784 Threads: 12
 Cobrajet67's Country Flag  View Cobrajet67's 6 photos
Oxford   New Jersey
Cobrajet67 is on a distinguished road
Default

yeah, a bad fuel pressure regulator-it's just dumping fuel back into the tank via the return line instead putting it into your engine.
Cobrajet67 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-27-2008   #6 (permalink)
Blk Stallion is offline Made Member

5.0L Member


Joined: Feb 2008
Posts: 246 Threads: 75
 Blk Stallion's Country Flag
Fort Walton Beach   Florida
Blk Stallion is on a distinguished road
Default

Sounds like a regulator since pressure dumps instantly.
__________________
Someone get the boy a bed cuz I'm catching Zs... Team Blue Oval
Blk Stallion is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-29-2008   #7 (permalink)
primer gt is offline Apprentice

5.0L Member


Joined: May 2008
Posts: 75 Threads: 13
 primer gt's Country Flag
Phoenix   Arizona
primer gt is on a distinguished road
Default

thats prob going to be the next thing that i change but i think i found the prob 3* of timing
primer gt is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-31-2008   #8 (permalink)
primer gt is offline Apprentice

5.0L Member


Joined: May 2008
Posts: 75 Threads: 13
 primer gt's Country Flag
Phoenix   Arizona
primer gt is on a distinguished road
Default

k

car still has the bad stutter i replaced many parts and only thing left is the fuel pump


new coil, ignition control module, plugs, wires, cap, rotor, just timed, fuel filter, pump relay, regulator, injectors, cleaned iac, k&n air filter
tested fuel pressure again now 30 idle and 40 peak with new regulator and still drops instanly to 0

suggestions pump?
primer gt is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-31-2008   #9 (permalink)
Sic89GT is offline Rookie


Joined: May 2008
Posts: 30 Threads: 3
 Sic89GT's Country Flag
El Paso, Tx   Texas
Sic89GT is on a distinguished road
Default

well if you are going to replace the pump no matter what, i'd go with a walbro. ive have a 255L/h from them for about 8 years and its never failed still running as strong as the day i bought it. Tho they can be a little expensive for some people, but for how long ive had mine it was worth every pennie
Sic89GT is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-31-2008   #10 (permalink)
primer gt is offline Apprentice

5.0L Member


Joined: May 2008
Posts: 75 Threads: 13
 primer gt's Country Flag
Phoenix   Arizona
primer gt is on a distinguished road
Default

k
but ive done the pressure test how do you do teh volume test
primer gt is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162