Something doesn't sound right. Your filter is on the pressure side of the fuel pump, not the suction side. If it had a leak, you ought to see some fuel dripping. Also, if the fuel drained back because of a small leak there, the fuel from the filter would still be air-free. Just the injection pump would get a bit air-bound. That usually results in starting problems after being shut-down for a day. Engine starts hard, but does start and runs fine once it runs a bit.
There were several Chevy and US military service bulletins about the problem. Ford-IH 6.9s had similar issues caused by a Schrader valve leaking air.
The fix was to install an updated fuel pump, along with an updated regulator/check valve on top of the injection pump. Both had enhanced check-valves to prevent overnight fuel drain-back.
Here's a copy of the bulletin:
Chevrolet bulletin # 89-329-6 Subject: 6.2L Diesel Hard starting cold Issue date: 9-20-91
All trucks with 6.2 diesel 1982-1989 except 88/89 CK trucks with electric fuel pumps.
Even if the glow system is working properly, some 1982-89 General Motors trucks equipped with 6.2L diesel engines may still experience cold, hard starts. GM says air leaks in either the suction or return side of the fuel system are the source of the problem. After the engine is shut down, air leaks can result in loss of injector pump fuel prime.
If the air leaks are on the suction side of the fuel system, GM recommends installing a new mechanical fuel pump GM P/N 25116503 and AC Delco P/N 43254. The new pump features a new ventless check valve to prevent drainback.
If the air leaks are on the return side, a new HPCA (Housing Pressure Cold Advance) regulator valve (P/N 10149645) must be installed. This new valve and seal configuration superceded the old ball check regulator valve....
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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[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.
