SPONSORED LINKS

Crank no start?

Tiny
PARDUE1360
  • MEMBER
  • 1993 FORD F-150
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 168,000 MILES
Fuel pump relay not closing, both pumps run when connected to battery 12vdc, spray fuel into engine and it'll run, with pump straight wired and correct fuel pressure still we not start.
Sunday, December 18th, 2022 AT 12:23 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,779 POSTS
Hi,

First, switch the PCM power relay with a different one having the same part number to see if it makes a difference.

If there isn't a relay with the same part number, here is a link that explains how to test one:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I also attached the schematic for the fuel pump. If the relay won't actuate by itself, either we have no power from the power relay or there is no ground path via the PCM. We will need to check that.

Let me know what you find.

Joe

See pics below.
Images (Click to make bigger)
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, December 18th, 2022 AT 12:15 PM

Please login or register to post a reply.

Related Engine Not Running Content

How to fix an engine that wont start
VIDEO
How to fix an engine that wont start
Instructional repair video
Engine Not Starting
GUIDE
Engine Not Starting
Over the past 20 years at 2CarPros we have identified the top problems that are easily fixed. This guide can save you a trip to the repair garage or calling a tow truck and...
VIEW MORE

Sponsored links