Fuel Pressure-No FPR Shim - PowerStrokeNation : Ford Powerstroke Diesel Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 26 (permalink) Old 05-03-2011, 05:18 AM Thread Starter
PSN Local
 
Join Date: Mar 2011
Location: Silverton, OR
Posts: 78
Question Fuel Pressure-No FPR Shim

What should fuel pressure be at idle on a unshimmed stock OBS FPR?

Mine sits right at about 50 psi, is this too low??

1997 F-350 Crew Cab Long Bed SOLD
2008 F-350 CCLB King Ranch- Spartan Tuned, Exhaust, Intake
Flippincgfighter is offline  
Sponsored Links
Advertisement
 
post #2 of 26 (permalink) Old 05-03-2011, 08:46 AM
PSN Local
 
excavator's Avatar
 
Join Date: Jan 2008
Posts: 236
Re: Fuel Pressure-No FPR Shim

that is good at idle however I had 50 at idle and dropped below 30 when pulling a trailer and lost power and boost would not get over 10. I changed the fuel pump and all power and boost came back.

96 F250 XLT 4x4 210000 miles Dana 60, Baby Swamped,Tony Wildman tunes,AutoMeter Pyro Boost Trans ,DPP downpipe,Tymar intake BTS TRANS

e99 f350 cc/lb drw php hydra plus Tony Wildman tune


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
excavator is offline  
post #3 of 26 (permalink) Old 05-03-2011, 02:10 PM
OBS Addict
 
7.3psd97444's Avatar
 
Join Date: Mar 2011
Location: Blairsville PA
Posts: 1,538
Re: Fuel Pressure-No FPR Shim

Yeah 50 is good at idle. If your worried about something rig up gauging that you can see while driving. This is to check and see if your loosing pressure. Which like said above means your fuel pump is bad.

-Jordan-
97 SCLB 7.3 Handshaker
Valair Clutch, only the best.
TS 6 Position Tyrant Tuning
S&B, MBRP, Isspro, Mag-Hytec, 1.00 A/R Exhaust housing, HPX
Full sound system: Kicker-Kenwood
BILLET BADGES
Dick Cepek DC-2's/Duratracs
On-Board Air
Few cosmetics
PSA # 269
7.3psd97444 is offline  
 
post #4 of 26 (permalink) Old 05-03-2011, 07:02 PM Thread Starter
PSN Local
 
Join Date: Mar 2011
Location: Silverton, OR
Posts: 78
Re: Fuel Pressure-No FPR Shim

Yesterday when i checked it, it was bouncing between 50-55 psi. Fluttering, but a short range of PSI. Last night i drove it a bit and checked it again, and at idle it was bouncing between 40-50 PSI. Now this morning its fluctuating a lot more from 30-50psi at idle. Any ideas? Seems like pretty low PSI to me.

1997 F-350 Crew Cab Long Bed SOLD
2008 F-350 CCLB King Ranch- Spartan Tuned, Exhaust, Intake
Flippincgfighter is offline  
post #5 of 26 (permalink) Old 05-03-2011, 07:09 PM
PSN Veteran
 
strokeorcroak's Avatar
 
Join Date: May 2009
Posts: 2,423
Re: Fuel Pressure-No FPR Shim

Gibson it sure seems low to me. The pressures shouldnt bounce like that, maybe because the pump is cam operated that it fluxuates in pressure, but it doesnt seem right to jump 10psi.

Where could air be getting into that system to cause the pressure to jump around??

1996 with 35s
615hp/1258tq on 9/19
strokeorcroak is offline  
post #6 of 26 (permalink) Old 05-03-2011, 07:16 PM
I know nothing...
 
joedaddy's Avatar
 
Join Date: Apr 2009
Location: Gridley Ks.
Posts: 6,115
Re: Fuel Pressure-No FPR Shim

Quote:
Originally Posted by strokeorcroak View Post
Gibson it sure seems low to me. The pressures shouldnt bounce like that, maybe because the pump is cam operated that it fluxuates in pressure, but it doesnt seem right to jump 10psi.

Where could air be getting into that system to cause the pressure to jump around??

Doesn't roll with anyone or tag along to be cool...
joedaddy is offline  
post #7 of 26 (permalink) Old 05-03-2011, 07:23 PM Thread Starter
PSN Local
 
Join Date: Mar 2011
Location: Silverton, OR
Posts: 78
Re: Fuel Pressure-No FPR Shim

Next step is to check for air. Thanks guys!

1997 F-350 Crew Cab Long Bed SOLD
2008 F-350 CCLB King Ranch- Spartan Tuned, Exhaust, Intake
Flippincgfighter is offline  
post #8 of 26 (permalink) Old 05-03-2011, 07:31 PM
PSN Veteran
 
strokeorcroak's Avatar
 
Join Date: May 2009
Posts: 2,423
Re: Fuel Pressure-No FPR Shim

Quote:
Originally Posted by Flippincgfighter View Post
Next step is to check for air. Thanks guys!
I dont really know where the air could be getting in though!? I didnt mess with the mechanical setup much before i swapped over so i feel like an idiot here...
Could the pump be failing and pulling air into the system? Seems like thats the most logical piece in my mind.
Theres not much room between filter/pump/heads for air to get in there, and it would have to be on the suction side.

1996 with 35s
615hp/1258tq on 9/19
strokeorcroak is offline  
post #9 of 26 (permalink) Old 05-03-2011, 07:56 PM Thread Starter
PSN Local
 
Join Date: Mar 2011
Location: Silverton, OR
Posts: 78
Re: Fuel Pressure-No FPR Shim

Selector valve? Maybe around the tanks? Im gonna put a clear hose between the pump and bowl, and im guessing ill find air bubbles. If i do ill start tracing the lines back. Arent they steel most of the way back? Weird thing is that it doesnt have a leak anywhere, and the running bad problem is sparratic. It hasnt ran bad yet since i put the gauge on. Ill be curious to see the fuel pressure when it misses bad.

1997 F-350 Crew Cab Long Bed SOLD
2008 F-350 CCLB King Ranch- Spartan Tuned, Exhaust, Intake
Flippincgfighter is offline  
post #10 of 26 (permalink) Old 05-03-2011, 08:00 PM
PSN Veteran
 
strokeorcroak's Avatar
 
Join Date: May 2009
Posts: 2,423
Re: Fuel Pressure-No FPR Shim

Quote:
Originally Posted by Flippincgfighter View Post
Selector valve? Maybe around the tanks? Im gonna put a clear hose between the pump and bowl, and im guessing ill find air bubbles. If i do ill start tracing the lines back. Arent they steel most of the way back? Weird thing is that it doesnt have a leak anywhere, and the running bad problem is sparratic. It hasnt ran bad yet since i put the gauge on. Ill be curious to see the fuel pressure when it misses bad.
Yeah it only runs bad when your NOT trying to fix it haha.... Hence why it ran like a charm up at my place.

But the lines are steel all along the frame rail, they are rubber from frame to tank and from frame to engine. But even the rubber ones are steel enforced lines, doesnt seem like they would randomly start pulling air!

I bet its up in the valley somewhere

1996 with 35s
615hp/1258tq on 9/19
strokeorcroak 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