Like Tree0Likes

Fuel Pressure Readings

Reply
Old 04-11-2006, 08:24 PM
  #1
Registered
Thread Starter
Trade Score: (1)
 
onesickpantera's Avatar
 
Join Date: Feb 2005
Location: Michigan
My Boats: 1999 Pantera 24 Sport
Posts: 4,261
Default Fuel Pressure Readings

I have a stock 1999 502 Mag MPI. I have done a search and it appears I should have 41-46 PSI of fuel pressure. But, I couldn't find WHEN I should have this pressure? Is it measured with the key switch on and the pump running, at idle, at WOT, etc?

Also, should fuel pressure increase or decrease as rpms increase?

Thanks.
onesickpantera is offline  
Reply With Quote
Old 04-12-2006, 12:12 AM
  #2
Registered
 
Tonto's Avatar
 
Join Date: Oct 2000
Posts: 1,782
Default Re: Fuel Pressure Readings

If you've done the research, and that's what it tells you for fuel pressure with a MPI (Multi Port Injection), I would think that's what you should have ALL the time.

Robert
Tonto is offline  
Reply With Quote
Old 04-12-2006, 07:01 AM
  #3
Registered
Trade Score: (1)
 
29KILROY's Avatar
 
Join Date: Mar 2004
Location: LOCKPORT, N.Y.
My Boats: -272, Killer 29 Outlaw, Boatless- For Now....
Posts: 689
Default Re: Fuel Pressure Readings

It should be done @ WOT. I run my 454mags @ 42psi but mine are not stock motors.
29KILROY is offline  
Reply With Quote
Old 04-12-2006, 08:44 AM
  #4
Registered
Thread Starter
Trade Score: (1)
 
onesickpantera's Avatar
 
Join Date: Feb 2005
Location: Michigan
My Boats: 1999 Pantera 24 Sport
Posts: 4,261
Default Re: Fuel Pressure Readings

Quote:
Originally Posted by Tonto
If you've done the research, and that's what it tells you for fuel pressure with a MPI (Multi Port Injection), I would think that's what you should have ALL the time.

Robert
Well, my research was done here and now I am getting conflicting numbers. Some are saying 41-46 and others are saying 28-32. BIG difference. I guess I will order a Merc shop manual for my motor.

And yes you are correct it should have the same fuel pressure all the time. Thanks.
onesickpantera is offline  
Reply With Quote
Old 04-12-2006, 09:57 AM
  #5
Registered
Trade Score: (3)
 
BGIII's Avatar
 
Join Date: May 2001
Location: West Michigan
My Boats: 34 Saber
Posts: 1,383
Default Re: Fuel Pressure Readings

Scott,

I believe the lower numbers were for the older VST systems and the higher numbers are for the cool fuel system. That being said, I'd rather buy a manual now and know for sure rather than an engine and a manual later.
BGIII is offline  
Reply With Quote
Old 04-12-2006, 10:12 AM
  #6
Registered
Thread Starter
Trade Score: (1)
 
onesickpantera's Avatar
 
Join Date: Feb 2005
Location: Michigan
My Boats: 1999 Pantera 24 Sport
Posts: 4,261
Default Re: Fuel Pressure Readings

Quote:
Originally Posted by BGIII
Scott,

I believe the lower numbers were for the older VST systems and the higher numbers are for the cool fuel system. That being said, I'd rather buy a manual now and know for sure rather than an engine and a manual later.
Getting ready to order now! I spoke with a member last night that had a manual for 1995-1997 502 Mags and the VST motors were 32-36 lbs and the Cool Fuel were 28-32lbs. So, according to that the Cool Fuel had lower pressure. But, obviously some changes could have been made between 1997 and 1999.
onesickpantera is offline  
Reply With Quote
Old 04-12-2006, 10:16 AM
  #7
Registered
Trade Score: (3)
 
BGIII's Avatar
 
Join Date: May 2001
Location: West Michigan
My Boats: 34 Saber
Posts: 1,383
Default Re: Fuel Pressure Readings

Mine are 2000's with cool fuel and I checked it static last summer and it was in the mid 40's.
BGIII is offline  
Reply With Quote
Old 04-12-2006, 10:20 AM
  #8
Registered
Trade Score: (1)
 
29KILROY's Avatar
 
Join Date: Mar 2004
Location: LOCKPORT, N.Y.
My Boats: -272, Killer 29 Outlaw, Boatless- For Now....
Posts: 689
Default Re: Fuel Pressure Readings

same here BG
29KILROY is offline  
Reply With Quote
Old 04-12-2006, 11:15 AM
  #9
Registered
Thread Starter
Trade Score: (1)
 
onesickpantera's Avatar
 
Join Date: Feb 2005
Location: Michigan
My Boats: 1999 Pantera 24 Sport
Posts: 4,261
Default Re: Fuel Pressure Readings

Quote:
Originally Posted by BGIII
Mine are 2000's with cool fuel and I checked it static last summer and it was in the mid 40's.
BGIII and 29Kilroy, do you guys have stock motors? Thanks.

Last edited by onesickpantera; 04-12-2006 at 11:21 AM.
onesickpantera is offline  
Reply With Quote
Old 04-12-2006, 11:30 AM
  #10
Registered
Trade Score: (3)
 
BGIII's Avatar
 
Join Date: May 2001
Location: West Michigan
My Boats: 34 Saber
Posts: 1,383
Default Re: Fuel Pressure Readings

No they are not but I am sure that they started in the 40's. Are you putting an adjustable regulator on or just concerned that you may have an issue?
BGIII is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
racer-x6
General Q & A
1
06-18-2008 01:15 PM
Rage
General Q & A
0
05-06-2008 12:00 PM
OSO News
Offshoreonly Industry News
0
12-05-2007 04:14 PM
sleeper_dave
General Q & A
31
07-07-2006 11:13 AM
BAD-HABIT
General Q & A
9
05-06-2003 04:08 PM



Posting Rules
You may not post new threads
You may not 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



All times are GMT -5. The time now is 10:30 PM.


Copyright 2011 OffShoreOnly. All rights reserved.