Fuel system begins pulsing?

1995 FORD F-150

150,000 MILES • 4.9L • 6 CYL • 2WD • AUTOMATIC

REVKEV316

MEMBER
19 POSTS
FOLLOW

I have a 1995 Ford F150 4.9L engine. it will start and run for 30 seconds to 1 minute then shut off like it loses power to engine. When it dies the fuel pump, fuel pump relay and an injector begin clicking/pulsing continously. It does the same whether on the front or rear tank. I have replaced the coolant temp sender (gauge still doesn't work), and the ignition control module as well as cleaned the oil soaked electrical plug from the distributor.

Nov 18, 2025 at 2:55 PM

STRAILER

✓ASE Certified Mechanic
54,494 POSTS

These trucks had big problems with the switching valve which is under the truck on the driver side frame rail. If that is okay or is new,

1. Replace EEC - PCM power relay (100% do this first)
($10, fixes the clicking almost every time)

2. Replace Fuel Pump Relay
(sitting right next to it, cheap)

3. Clean/restore PCM grounds
Left fender apron
Core support
Battery-to-fender
Battery-to-block
Block-to-firewall strap

Here is the location of the fuel switching valve and the EEC relay (PCM) which I will email you as well. Check out the images (below). Please let us know what happens.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
Click here to log in and view diagram.

Nov 19, 2025 at 9:26 AM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.