Getting low fuel pressure at fuel rail

Tiny
TRIEDITDONE
  • MEMBER
  • 2003 FORD F-150
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 156,000 MILES
I recently bought a fuel pressure test at an auto parts store and when I hooked it up I was only getting about 17 psi when idle. Did a long term fuel pressure drop as well, but the pressure remains for a good 8-10 hours but does drop overnight. Another odd thing is when key is set to on but not starting, the pressure barely climbs any psi (only about 1-2 psi). Starting to think that the fuel pump is going bad, also I bought a new fuel filter because it’s about time to replace it as well. Just want to know any suggestions on this matter. This was a solution I was looking into for my truck hesitating while starting. What I mean by hesitation is the truck will start, but sometimes it will take 4-8 seconds.
Do you
have the same problem?
Yes
No
Thursday, May 21st, 2020 AT 2:57 PM

4 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

You need a fuel pump. You confirmed your self with the pressure test. That is also the reason for the delayed starting as well.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

I would replace the filter as well when you do the pump.

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

Roy
Was this
answer
helpful?
Yes
No
+1
Thursday, May 21st, 2020 AT 3:54 PM
Tiny
TRIEDITDONE
  • MEMBER
Thanks a lot for the reply. I think I m going to get right to it tomorrow go grab the parts and see what I can do hoping it doesn t rain. I ll post a update and see if it fixes the problem. Thanks again you guys are great.
Was this
answer
helpful?
Yes
No
Thursday, May 21st, 2020 AT 8:41 PM
Tiny
TRIEDITDONE
  • MEMBER
Another quick question, could a deteriorating fuel pump cause a lean bank code p0171 or p0174? Thanks again.
Was this
answer
helpful?
Yes
No
Thursday, May 21st, 2020 AT 9:39 PM
Tiny
ASEMASTER6371
  • EXPERT
The low fuel pressure will definitely cause the 171, 174 codes.

They should go away when you install the new pump.

Roy
Was this
answer
helpful?
Yes
No
Friday, May 22nd, 2020 AT 4:07 AM

Please login or register to post a reply.

Sponsored links