should the fuel system always retain pressure? - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 03-28-2012
rangerrunner11's Avatar
Member
Thread Starter
 
Join Date: Feb 2011
Location: .
Posts: 1,018
should the fuel system always retain pressure?

having problems and trouble shooting

battery was removed from truck to get new one, decided to remove cap on fuel line and push in the valve and very very very little fuel came out. should the system still retain pressure with battery out and truck sitting without driving for 2 days?

hasnt been starting lately and just cranking away so I feel its either the fuel pump or CPS.

so does the fuel systm retain pressure for upward of a day maybe 2 and without the battery connected?
Reply With Quote
  #2  
Old 03-28-2012
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,831
Quote:
Originally Posted by rangerrunner11 View Post
so does the fuel systm retain pressure for upward of a day maybe 2 and without the battery connected?
There is a check ball that should prevent fuel from moving from the fuel lines back into the tank after the pump turns off. It usually holds some rail pressure for anywhere from several minutes to several hours after shut down. Eventually the pressure in the lines and rails will drop to tank pressure which is near zero compared to running line pressure.

Anyway, the short answer is that it doesn't matter if the pressure drops off after a day. However, the fuel pressure should come right back up to max as soon as the ignition is turned on.
Reply With Quote
  #3  
Old 03-28-2012
rangerrunner11's Avatar
Member
Thread Starter
 
Join Date: Feb 2011
Location: .
Posts: 1,018
Quote:
Originally Posted by rwenzing View Post
Anyway, the short answer is that it doesn't matter if the pressure drops off after a day. However, the fuel pressure should come right back up to max as soon as the ignition is turned on.
Thats the thing that is stopping me from checking is the battery is utterly dead and therefore I have no power to re-pressure the lines to test. Im glad it is normal for the line to lose pressure because it literally had none. thanks bob
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1990 4.0L: How do you remove the 90 Fuel Line from the Fuel Pressure Regulator? thalightguy 4.0L OHV & SOHC V6 Tech 3 09-07-2012 05:47 PM
4.0 OHV Fuel Pressure / After-market Fuel Pump Rooks 4.0L OHV & SOHC V6 Tech 1 12-28-2011 12:52 PM
fuel pressure regulator or fuel pump fedupdon General Technical & Electrical 1 01-31-2011 07:04 AM
Low tire pressure gauge always on now that i changed tires and wheels Cooke15 General Technical & Electrical 3 02-26-2008 08:32 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 02:40 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.