3.0 to 4.0 swap fuel return problem - 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.

LinkBack Thread Tools Search this Thread
Old 10-12-2009
Thread Starter
Join Date: Jun 2009
Location: Woodbine, IA
Posts: 8
Icon5 3.0 to 4.0 swap fuel return problem

I am swapping from a 3.0 to a 4.0 and noticed the 4.0 has a fuel return line. I asked Ford about this and they said it is used for pressure to injectors.

I am wondering what I need to buy and do so this will be set up for the 4.0 to be used in the truck. Any information will help with this.

Reply With Quote
Old 10-12-2009
V8 Level II's Avatar
RF Veteran
iTrader: (4)
Join Date: Nov 2004
Location: Michigan
Posts: 7,834
One is a return-type system with the pressure regulator on the fuel rail; the other is returnless with the regulator in the tank. The two systems run at very different pressures and require different flowrate injectors. You must match the pump/lines/regulator/ injectors/fuel rails/PCM from a compatible donor or it won't work.

A 98+ 4.0L will be returnless like your 3.0L but this type of swap is still a minefield of potential problems. Staying with the same year donor as your truck is the best way to avoid compatibility issues.

Last edited by V8 Level II; 10-12-2009 at 11:54 AM.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Want to Buy: Fuel line between fuel filter & fuel pump - TN iplayloudly Interior, Exterior, Electrical, & Misc. 7 05-02-2012 04:10 PM
88 Ranger, Fuel Return Line Cracked Stumpknocker 2.9L & 3.0L V6 Tech 5 01-08-2011 11:39 AM
What to get with tax return? 0RangerEdge2 2.9L & 3.0L V6 Tech 16 02-15-2007 11:30 PM
got tax return, need new rims and tires 03DualSport Wheels & Tires Semi-Tech 13 01-26-2007 01:12 PM
tax return! Buck General Ford Ranger Discussion 60 01-17-2007 11:06 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 08:16 AM.

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.