fuel pump wiring issues

94ndnstang

New Member
Apr 15, 2019
4
0
1
37
Michigan
chasing a fuel pressure issue pump will not push any fuel have to turn the key 10 times to get up to 40psi brand new pump tank etc blew out the lines w air kinda stuck at this point
 
  • Sponsors(?)


08GT500

Active Member
Jul 12, 2018
806
113
53
Massachusetts
Hi,
Did you check for any ECU codes?
What preceded this issue, a performance issue, hard starting, etc?
Full tank of fuel, change the fuel filter..? You mentioned a new fuel pump, was this installed before or after the fuel pressure read as low, fuel pumps designed for constant voltage (return style) & run always at 100% power may overheat in a variable DC control application (returnless). Verify it’s part #.
Little confused as to “cycling the key to reach 40lbs of pressure”, you’re just measuring the Prime? Check your Fuel pressure regulator for leaks & compare pressures after disconnecting.
Does the car run, what’s the fuel pressure read when the engine’s running? I’m assuming you’re reading fuel pressure from a gauge on the rail, what does a scan-tool read the fuel pressure as, may simply be a faulty gauge(?)
If the pump is running intermittent, it may cause low pressure readings, check your grounds, pump wiring. Less likely but possible, an injector or injectors that are stuck open.
Have a shop manual on the vehicle?
Good luck!
-John
 
Thread starter Similar threads Forum Replies Date
wbrockstar Help Needed To Identify Wiring Component On Hanger At Fuel Pump 1994 - 1995 Specific Tech 0
N Fuel issue 2000 v6 SN95 V6 Mustang Tech 2
J Bad wiring for fuel pump relay/constant priming? 1992 mustang gt Fox 5.0 Mustang Tech 8
N Electrical 94 Mustang Wiring to fuel pump and cooling fan 1994 - 1995 Specific Tech 0
Z Electrical I Cant Find The Fuel Pump Signal Wire 1994 - 1995 Specific Tech 1
L 94 Mustang GT fuel pump wiring 1994 - 1995 Specific Tech 19
S Electrical 2000 v6 fuel pump diagram SN95 V6 Mustang Tech 0
tjmi69 Fuel Fuel pump 3rd wire? Fox 5.0 Mustang Tech 2
R Shuts Off When Clutch Pedal Completely Released. Relays Clicking, Fuel Pump Wiring? Fox 5.0 Mustang Tech 6
E Electrical Fuel Pump Issue? 1994 - 1995 Specific Tech 3
T Wiring Diagram For Carb 302 With Mechanical Fuel Pump? Fox 5.0 Mustang Tech 0
Trent B 1986 Gt Shut Off/fuel Pump Issue Fox 5.0 Mustang Tech 4
Chrisb123 Electrical Yellow Solenoid Wire !!!help Fox 5.0 Mustang Tech 13
B 5.0 Swap Fuel Pump Wiring Question? Please Help! Fox 5.0 Mustang Tech 4
F Fuel Pump Wont Kick Fox 5.0 Mustang Tech 11
jchav02 Bigger Fuel Pump Wiring Upgrade? Fox 5.0 Mustang Tech 3
CobraWannabe No Pink/black Wire On Fuel Pump Relay Fox 5.0 Mustang Tech 31
89vortechvert Fuel Pump Wiring 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
Boostedpimp Electrical Does Anybody Have The Fuel Pump Wiring Schematics For A 91? Fox 5.0 Mustang Tech 26
R Fuel Pump Wiring Fox 5.0 Mustang Tech 15
1 Electrical Need help please! No spark, Fuel pump not priming, and a mystery wire. Fox 5.0 Mustang Tech 36
speedfreek95GT SOLD 03/04 Cobra Fuel Hat/pumps/sending Unit/wiring Engine and Power Adder Parts 1
M Pcm To Fpdm/fuel Pump Wires And Pins? 2005 - 2009 Specific Tech 2
jonbacon Re-wiring Fuel Pump...to Carb.. Fox 5.0 Mustang Tech 2
R Fuel Pump Wiring? SN95 4.6L Mustang Tech 4
L Fuel 1994 Gt Fuel Pump Wiring Help Needed 1994 - 1995 Specific Tech 8
KaLiKo Street Fuel Pump Wire Hunt Down Fox 5.0 Mustang Tech 7
C Fuel pump wiring question Fox Engine Swaparoo 1
T Does the fuel pump relay wiring run through the instrument cluster? Fox 5.0 Mustang Tech 6
G 1999 fuel pump wire colors/diagram? SN95 V6 Mustang Tech 1
F external fuel pump / wiring help Fox 5.0 Mustang Tech 4
MikeR351w Help wiring fuel pump cut off switch... Fox 5.0 Mustang Tech 3
LocoSway Fuel pump wiring help Fox 5.0 Mustang Tech 1
meltmanbob Fuel pump won't turn on unless wired to battery 2.3L (N/A & Turbo) Tech 1
SCORPIO72 DASH WIRING AND FUEL PUMP Fox 5.0 Mustang Tech 3
8 silly fuel pump circuit wiring problem making me mad Fox 5.0 Mustang Tech 10
M E.F.I. 2 Carb swap Wiring relay 4 fuel pump. Fox 5.0 Mustang Tech 1
J Fuel Pump Relay Wiring Help Please/Carb Conversion Fox 5.0 Mustang Tech 2
S focus fuel pump wiring harness??? big problem!!! SN95 4.6L Mustang Tech 3
8 how many wires on the fuel pump relay get 12 volts? Fox 5.0 Mustang Tech 2
M Wiring for the fuel pump on a 86?!HELP!? Fox 5.0 Mustang Tech 2
hotmustang331 Performed the fuel pump wiring upgrade..RESULTS SN95 4.6L Mustang Tech 9
K fuel pump wire Fox 5.0 Mustang Tech 1
J Help...Fuel Pump Relay wire SN95 4.6L Mustang Tech 2
1 fuel pump wiring help! Fox 5.0 Mustang Tech 0
W wiring fuel pump Fox 5.0 Mustang Tech 2
9 how did everyone wire there electric fuel pump on carb setup? Fox 5.0 Mustang Tech 5
mustang_montana fuel pump relay wiring shorted somewhere...need help Fox 5.0 Mustang Tech 2
ram360 Wiring Guru's Fuel Pump Problem Fox 5.0 Mustang Tech 26
old_blue NEED HELP, BROKE WIRE TAB ON FUEL PUMP Fox 5.0 Mustang Tech 8
Similar threads