1997 7.3 Fluctuating Fuel Pressure - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 04-17-2018, 06:19 PM Thread Starter
PSN Newb
 
MattieS's Avatar
 
Join Date: Mar 2017
Posts: 15
1997 7.3 Fluctuating Fuel Pressure

Does anyone know if fluctuating fuel pressure is normal for the obs 7.3?

I have an electric fuel pressure gauge installed on the fuel bowl, and at idle it jumps randomly between 50 and 70 psi (I have the FPR shimmed to 70psi) and under WOT the pressure drops off to about 35 psi.

I've read that the pressure shouldn't be steady due to the mechanical fuel pump, but this seems like a lot of variation to me. At idle my truck shakes considerably, and seems to be lacking power.

I've changed the fuel filter and pulled the fuel tanks to check if the in-tank screens were plugged, but there are no screens. Hoping someone has some advice. Thanks.
MattieS is offline  
Sponsored Links
Advertisement
 
post #2 of 2 (permalink) Old 04-17-2018, 06:52 PM
PSN Veteran
 
HilhavenFarm's Avatar
 
Join Date: Aug 2017
Location: Yadkin Valley,NC
Posts: 668
Re: 1997 7.3 Fluctuating Fuel Pressure

If no shower heads are present then how are hoses positioned for fuel pickup? Are hoses collapsing, restricting fuel out of tank?

I had this in an older IDI that someone had fixed without shower heads. I redid with E5TZ-9J306-BA and it worked fine afterwards.

My .02
Attached Images
File Type: jpg E5TZ-9J306-BA_Shower head.jpg (12.2 KB, 4 views)

1996 F350 XL Crew Cab LB 4x4 3:55
Former Ft. Bragg/Pope AFB Truck
DieselSite Coolant Filter
Riff Raff Diesel Turbo & Y Boot Kit
Riff Raff Diesel HPX
Mile Marker 449SS Manual Hubs

1987 F250 XLT Lariat LB 2WD 4:10
6.9/7.3 IDI Swap-SOLD
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


2010 John Deere 5055D

1974 Deutz 5506
2950 hours-"The Tank"
HilhavenFarm is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the PowerStrokeNation : Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome