88 YJ with injected 4L - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > 88 YJ with injected 4L

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineSavvy Billet LED Tail LightsLight up the holidays with LED lights from JeepHut

Reply
Unread 04-03-2013, 09:20 AM   #1
navinke
Registered User
 
Join Date: Apr 2013
Location: Ottawa, Ontario
Posts: 45
88 YJ with injected 4L

Hello ALL,

I recently purched a 88 YJ with a 95 injected 4.0L in it
It is hard to start, but once it fires it runs great
It does have a new in-line fuel pump
My question is
(Not knowing what the previos owned did)
I understand the fuel pressure regulator in a stock 88 is in the top of the tank
Should the diaphram be removed or a hole punched in it?
The fuel pump is lould and I am wondering if it is having trouble pulling fuel through the original regulator

Thanks

navinke is offline   Reply With Quote Quick reply to this message
Unread 04-03-2013, 10:52 AM   #2
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,695
It has an inline fuel pump? Does it have a return line for the fuel system? Usually the fuel pump primes the system before starting. I am not sure with an inline that you can do it. Go to your local parts store and get a fuel pressure guage from their tool loan program. Measure the fuel pressure: 31 psi running, 39psi when you disconnect the vacum line on the pressure regulator on the fuel rail, and then turn it off and see if the pressure stays above 20 psi after waiting 20 minutes.

I think your best bet is finish the upgrade where he stopped. Get a plastic tank setup out of a 91-95. If you are interested I can point you in the right direction and I think you would be looking at $100-200 american for the entire setup from the guy here in Michigan who parts them out.

http://www.cfoffroad.com/
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 04-03-2013, 11:00 AM   #3
navinke
Registered User
 
Join Date: Apr 2013
Location: Ottawa, Ontario
Posts: 45
Thanks for the reply
Yes aftermarket in line fuel pump with return line and it does have a plastic tank in it now
I will start by checking fuel pressure
navinke is offline   Reply With Quote Quick reply to this message
Unread 04-03-2013, 12:33 PM   #4
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,695
The fuel pump needs to hold the prime pressure for start. It sounds like you might need to add a check valve of some sort in front of the pump if it doesn't hold back pressure like the stock system does.
Que89YJ is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.