Depends on the fuel system and flows on whether or not you can tee back to the lift pump inlet. On a common rail fuel system the lift pump supplies high pressure fuel pump and most are inlet metered (the restrict flow through a fuel control valve on the inlet side) to maintain rail pressure with lots of fuel maps and algorithms. The excess lift pump flow generally goes back to tank. Some flow goes to cool the HPFP an injectors and picks up some heat. Depending on the injector design you have some injector spill which is scalding hot but on some of the newer systems they have ZSL (zero static leak) injectors which barely have any spill at all. Depending on the lift pump flow and how much cooling flow for pump and injectors and injector spill going back you might be able to get away with a tee back to inlet of the lift pump. Priming after a filter change becomes an issue because there is no way to prime the circuit without having to open the line at the HPFP inlet to let air escape. You can use a bleed orifice in the filter base or at the hpfp inlet to let air out and send that back to tank along with the hot fuel from pump and injector cooling and injector spill. Recirculating excess lift pump flow on engine will do wonders for fuel system component life but will shorten filter life as you're actually getting the dirt in the filters instead of passing it through.
If it's an older pump and nozzle system you can just recirculate fuel but still have the same priming issues.
Unit injector systems really need fuel to go back to the tank to cool off or will need a good fuel cooler.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
... [Read Article]
Latest Ad:
2022 John Deere 5045E, 4wd, front end loader and 3rd function with grapple. 120 hrs, 55k new, must sell
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
