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I replaced the fuel pump on my 1991 ford f150 5.0l xlt

Customer Question
I replaced the fuel...

I replaced the fuel pump on my 1991 ford f150 5.0l xlt lariat, and i only get cranking but no start

Mechanic's Assistant: Have you ever replaced the fuel pump, or is this the original?

I just replaced the fuel pump yesterday

Mechanic's Assistant: Are you fixing your F150 yourself? What have you tried so far?

I replaced the fuel pump, and ran a circut tester to the harness to see what was wrong, my orange wire has no voltage coming from it

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I did try the inertia switch, that is fine and opperational

Submitted: 1 month ago.Category: Ford
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1/4/2018
Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 month ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Ford
Satisfied Customers: 4,810
Experience: Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic Vehicles
Verified

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 month ago

Hey how are you,I will try to help you with this issue

click on link to view fuel pump wiring diagram

where is this orange wire located on the fuel pimp connector

based on these diagrams orange wire goes back to black which is ground

at the fuel pump relay there is 4 pins, , a red ,a yellow light blue/ orange , a dark green/ yellow , tell what you have on them

if the fuel pump not running,. if you spray starting fluid on intake or tb body does start and run and dies ?

If you do not mind me asking ,are you looking at fixing this yourself or looking to know the most possible cause of this issue and taking it to repair shop for the work ?

Do you have any prior experience in electrical troubleshooting and testing with a test light for power & ground ?

Do have a power probe for testing ?

Do you have a test light so we can check for spark ?

Do you have fuel pressure tester to check for fuel ?

Did you scan it with factory scanner or equivalent to retrieve faults codes for vehicle modules ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

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Customer reply replied 1 month ago
okay so
1. the orange wire is located at the far right end of the connnector that goes into the pump/sending unit.
2.i have (in this order) a black, a dark green/yello, a red, and an orange
3.i did not try to spray anything yet, but when i try to start truck, it shakes a bit and cranks, no whine coming from pump like i did before the old pump died.
4.im looking to fix it myself.
5.i have experience with troubleshooting.
6.i used a power probe for testing
7.where would i check for spark?
8.i have a fuel pressure tester which i will use to check my pressure for fuel
9.i have a scanner and i will check the codes if there are any
Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 month ago

ok sounds good man, i can help you with it

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Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 month ago

what is on the red wire switch on

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Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 month ago

spray fluid and let me know

fuel pressure specs

click on link to view the specs

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Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 month ago

Spark testing

no start chart

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Ford Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 month ago

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Chad Farhat
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Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Ford
Satisfied Customers: 4,810
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Experience: Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic Vehicles

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