(800) 853-2651
SHOP NOW

Ford 3910 injection pump?

Yesterday's Tractor Forums
R

RTC3910

New User
All I have a 3910 with I believe to be a cav pump. I was mowing with it the other day and had the mower load up heavily. Shortly after that I shut the tractor down to inspect mower and now the tractor will not start. I am suspecting the injection pump due to the lack of fuel pressure to the injectors. It drips out as if the injector pump is not operating correctly. I have bled it and verified fule to the pump. Only thing I can think is the pump has went bad.
 

Attachments

  • Tractor 2.mp4
    4.1 MB
The metering valve MIGHT be stuck in the fuel off position. Let it cool off and then try it again with the throttle set about 1/2 open. If it still won't start find a heavy wrench and tap the pump hydraulic head BETWEEN two outlet banjos 6-10 times. I've done this before to get one freed up and working again a few times. If there's ANY traces of water in fuel or Bio diesel this may not help and pump will need to come off for repair. It's possible the cam ring/shoes and rollers could be worn badly too.
 
Dieseltech said:
The metering valve MIGHT be stuck in the fuel off position. Let it cool off and then try it again with the throttle set about 1/2 open. If it still won't start find a heavy wrench and tap the pump hydraulic head BETWEEN two outlet banjos 6-10 times. I've done this before to get one freed up and working again a few times. If there's ANY traces of water in fuel or Bio diesel this may not help and pump will need to come off for repair. It's possible the cam ring/shoes and rollers could be worn badly too.
Click to expand...
Thanks dieseltech. I hadn't thought about tapping on it. Fuel looked good,
 
So, tapped on the pump, the top cover. Tractor started, now my cover is leaking. Suspect my tapping dislodged the gasket and now I have to replace the gaasket. Better than having to replace the pump. Hopefully I can do it in place.
 
RTC3910 said:
So, tapped on the pump, the top cover. Tractor started, now my cover is leaking. Suspect my tapping dislodged the gasket and now I have to replace the gaasket. Better than having to replace the pump. Hopefully I can do it in place.
Click to expand...
Tap on the HYDRAULIC HEAD, NOT the top cover! That two stud cover design was not smart to begin with...
 
I didn't tap on it to hard, but it is leaking badly now. Plan to replace the gasket for that cover. Thanks Dieseltech.
Any tips on cover removal and repair. Plan on replacing the orings while I have the cover off.
 
You must log in or register to reply here.
Yesterday's Tractor Forums
Buy Tractor Parts Here Buy Tractor Manuals Here

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.

Copyright © 1997-2025 Yesterday's Tractor Co.

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.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top