Low fuel pressure - Page 3 - Dodge Cummins Diesel Forum
89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

Reply
 
LinkBack Thread Tools Display Modes
post #25 of 74 (permalink) Old 04-20-2019, 12:42 PM Thread Starter
Newbie
 
Crazymonkey's Avatar
 
Join Date: Apr 2019
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Quote:
Originally Posted by GAmes View Post
Passing this on from someone who knows 1st gens much better than most. You could have an air leak caused by the heater plate square cut seal, a worn head/rotor inside the VE or a leaky fuel return line-the rubber elbow behind the head. Obviously the elbow would be the easiest to look at first.
Thanks for the ideas! I will start with looking at the elbow.

Any idea how to tell if the heater plate square cut seal is bad or is that something I should just replace & see if that works?

Crazymonkey is offline  
Sponsored Links
Advertisement
 
post #26 of 74 (permalink) Old 04-20-2019, 12:57 PM Thread Starter
Newbie
 
Crazymonkey's Avatar
 
Join Date: Apr 2019
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Quote:
Originally Posted by 9297oldram View Post
Quote:
Originally Posted by Crazymonkey View Post

Thanks!
The experience I have is other people that have had problems with the IP's. When you dump ice cold water on a IP that's not running right and it starts running like it should it means your IP needs a rebuild.

Just my opinion it's your gauge that's causing your problem if the truck still runs the same when your fuel pressure drops.

A couple years ago my fuel got some water in it and my fuel pressure would drop down to 1-2 psi and it was all I could do to keep it running and go about 35-40 MPH.
I have swapped out my gauge with another, but I will see if I can maybe hook up a test gauge directly to the banjo bolt and see if that makes a difference.

Thanks!
Crazymonkey is offline  
post #27 of 74 (permalink) Old 04-20-2019, 01:07 PM
Moderator
 
9297oldram's Avatar
 
Join Date: Sep 2010
Location: Huntington In.
Posts: 19,982
Thanks: 627
Thanked 2,172 Times in 2,029 Posts
iTrader Score: 0 reviews
Quote:
Originally Posted by Crazymonkey View Post
I have swapped out my gauge with another, but I will see if I can maybe hook up a test gauge directly to the banjo bolt and see if that makes a difference.

Thanks!
If you don't use a needle valve to keep the gauge needle from bouncing you won't be able to get a accurate reading.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
9297oldram is offline  
Sponsored Links
Advertisement
 
post #28 of 74 (permalink) Old 04-20-2019, 01:09 PM
Moderator
 
9297oldram's Avatar
 
Join Date: Sep 2010
Location: Huntington In.
Posts: 19,982
Thanks: 627
Thanked 2,172 Times in 2,029 Posts
iTrader Score: 0 reviews
Quote:
Originally Posted by Crazymonkey View Post
Thanks for the ideas! I will start with looking at the elbow.

Any idea how to tell if the heater plate square cut seal is bad or is that something I should just replace & see if that works?
Don't worry about the heater seals you will have fuel leaking if they are bad. You never mentioned about having fuel leaks, do you have any?

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
9297oldram is offline  
post #29 of 74 (permalink) Old 04-20-2019, 01:33 PM Thread Starter
Newbie
 
Crazymonkey's Avatar
 
Join Date: Apr 2019
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Quote:
Originally Posted by 9297oldram View Post
Don't worry about the heater seals you will have fuel leaking if they are bad. You never mentioned about having fuel leaks, do you have any?
I don't see any fuel leaks.

Thanks
Crazymonkey is offline  
post #30 of 74 (permalink) Old 04-20-2019, 03:28 PM
Diesel Head
 
GAmes's Avatar
 
Join Date: Sep 2009
Location: Killeen, TX
Posts: 15,951
Thanks: 149
Thanked 1,714 Times in 1,502 Posts
iTrader Score: 7 reviews
It turns out my friend misread the problem. So both the heater seal and the hose would leak fuel apparently. Another candidate is the shaft seal. Just passing on info.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.
To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
GAmes is offline  
post #31 of 74 (permalink) Old 04-20-2019, 04:57 PM Thread Starter
Newbie
 
Crazymonkey's Avatar
 
Join Date: Apr 2019
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Quote:
Originally Posted by GAmes View Post
It turns out my friend misread the problem. So both the heater seal and the hose would leak fuel apparently. Another candidate is the shaft seal. Just passing on info.
If the shaft seal was leaking would I see diesel in my oil?

Thanks!
Crazymonkey is offline  
post #32 of 74 (permalink) Old 04-20-2019, 05:16 PM
Moderator
 
9297oldram's Avatar
 
Join Date: Sep 2010
Location: Huntington In.
Posts: 19,982
Thanks: 627
Thanked 2,172 Times in 2,029 Posts
iTrader Score: 0 reviews
Quote:
Originally Posted by Crazymonkey View Post
If the shaft seal was leaking would I see diesel in my oil?

Thanks!
Yes, if the ip's front seal is leaking you'll have fuel in your oil.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
9297oldram is offline  
post #33 of 74 (permalink) Old 04-20-2019, 05:44 PM
Diesel Head
 
GAmes's Avatar
 
Join Date: Sep 2009
Location: Killeen, TX
Posts: 15,951
Thanks: 149
Thanked 1,714 Times in 1,502 Posts
iTrader Score: 7 reviews
Quote:
Originally Posted by Crazymonkey View Post
If the shaft seal was leaking would I see diesel in my oil?
You could have it but not "see" it. Fuel contamination is best found by oil analysis.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.
To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
GAmes is offline  
post #34 of 74 (permalink) Old 04-21-2019, 02:10 AM
Diesel Head
 
myother4x4isaCJ7's Avatar
 
Join Date: Aug 2016
Location: Dufur oregon
Posts: 3,602
Thanks: 42
Thanked 328 Times in 308 Posts
iTrader Score: 2 reviews
Quote:
Originally Posted by GAmes View Post
You could have it but not "see" it. Fuel contamination is best found by oil analysis.
If it was leaking enough fuel to give it that low of fuel pressure the oil level should raise significantly.
myother4x4isaCJ7 is offline  
post #35 of 74 (permalink) Old 04-21-2019, 08:34 AM
Diesel Head
 
GAmes's Avatar
 
Join Date: Sep 2009
Location: Killeen, TX
Posts: 15,951
Thanks: 149
Thanked 1,714 Times in 1,502 Posts
iTrader Score: 7 reviews
Quote:
Originally Posted by myother4x4isaCJ7 View Post
If it was leaking enough fuel to give it that low of fuel pressure the oil level should raise significantly.
Good point.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.
To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
GAmes is offline  
post #36 of 74 (permalink) Old 04-21-2019, 02:21 PM Thread Starter
Newbie
 
Crazymonkey's Avatar
 
Join Date: Apr 2019
Posts: 27
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
today it is 60 degrees out, I picked up a fuel pressure tester gauge and hooked that up directly to a T connected to the banjo bolt. Both my in-dash gauge and the tester gauge are reading 2 psi. Tester gauge bypassed the needle valve.

Thanks again!
Crazymonkey is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Dodge Cummins 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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Loss of power what's wrong westtxdiver 911 Urgent Situations 5 03-01-2014 05:46 PM
Furnace oil? LPU_911 Alternative Fuels, Additives, Oils & Lubricants 6 12-16-2013 11:12 AM
p0148 code on 06 mega cab bmart 3rd Gen. Powertrain 11 07-14-2012 10:07 PM
Who Really Knows ?? RAMIT222 98.5-02 Powertrain 17 04-08-2011 06:30 PM
Joe G's fuel system writeup ykdave 94-98 Engine 2 04-22-2008 09:13 AM

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