Post to the EFV-8 Forum
Post Classified Ads
Shop the Online Store

User Login

Not Registered Yet? Click Here to Sign Up!

Early Ford V-8 Club Forum

FORUM RULES: Users agree to these Rules when using Forum.

The site administrator reserves the right to change the terms and conditions of the user agreement without prior notice to the user. It is the responsibility of the user to regularly review the terms of this agreement.

The user agrees to the following terms:

All information that you provide to us for your membership is correct.
You will not use your membership to spam, harrass, or exploit other members in any way.
Vulgar, Abusive, Racist and Sexist Language will not be tolerated.
Commercial-type sales postings will not be allowed.
No mass posting or flooding of the boards is allowed.
No Advertising of parts or cars; no Ebay or business/commercial ads (please use the "Classified" for ads Wanted or For Sale).
VIEWING MULTIPLE TOPICS ON SCREEN: You can choose to see more than 10 Topics at a time ... Log In and choose "Preferences" from the top bar on the Forum page. Scroll down and Change the "Default Topics Returned" parameter to 25 or 50, and save the changes. Since this setting is stored in your browser 'cookies' (if enabled), it seems to use that stored value even if you are not logged in. So, if you use a PC that you haven't logged into the forum from, the setting still seem to remain at the default.
EXTERNAL PHOTO LINKS ON FORUM: You can still use external photo links in your posts on the new forum. They follow the rules of any link in that they have to have the URL link qualified down to the full image file name (example: .jpg). The links will open in a new browser window, the same as an uploaded image attached to a post. Since an image attachment to any post does not display inline with the post, the results are the same. You can use multiple external links within a post. This link is from photos on a site from Don Clink's 'Deuce@75' albums:

http://donclink.com/deuce_75_1/images/dscn2950.jpg

Using links from photo sites such as Photobucket can help in "size" issue with uploaded attachment files. For best viewing in web browsers, photos should be around the 800x600 pixel range, and probably not more than 1024x768. Most cameras today store HUGE jpg image files, as the default settings are in the 7, 8, 10, and 12Mb image sizes. The image files that are then attached are very large, and the browser can't display the full image size without using the scroll bars. Use the re-sizing functions of your photo editing software to reduce the image to 800x600, which reduces the file sixe and the image load time in the browser. Don uses Google's free Picassa3 software, which is an excellent photo management product. All of the photo albums of the Deuce, Grand National, and Auburn that are links on the NORG site were built using Picassa's web creation functions. And it's free? (THANKS to Don Clink for the info!)
HOW DO I SHOW MY EMAIL ADDRESS ALONG WITH MY USERNAME? You can LogIn on the Forum, and select PREFERENCES. On this page Members can add optional information such as their City,State, Country; Occupation; Hobbies: list a Homepage; list AOL Instant Messanger Handle; Signature; "Make Email Address viewable to others;" and even change the number of Default Topics shown on a page. WHEN others click on your profile, they will see this information.

EFV-8 Club Forum / General Ford Discussion / Fuel Pump Push Rod

Reply to Discussion | New Discussion

<< previous || next >>

Posted By

Discussion Topic: Fuel Pump Push Rod -- page: 1 2

Dolman

07-28-2011 @ 7:01 PM

reply profile send p.m.

New Member
Posts: 177
Joined: Dec 2010

I finally have a fuel pump that works but only produces 5 inches of vacuum installed. It produces 10 inches on the bench. Suspect a worn push rod. What is the procedure to pull the rod to measure it? Engine is a '34 V8.

This message was edited by Dolman on 7-28-11 @ 7:41 PM

supereal

07-28-2011 @ 9:43 PM

reply profile send p.m.

Senior
Posts: 6819
Joined: Oct 2009

Be sure you have the correct push rod if you have changed it. The rod for an aluminum intake. Is different from the cast iron rod. To pull the rod, remove the fuel pump stand and simply pull the rod up and out. It isn't unusual to get more vacuum when pumping the arm by hand on the bench because the motion of the rod doesn't work the pump to the extent that you do by hand. A fuel pump can be good inside, but lack stroke if the arm pivot is worn.

TomO

07-29-2011 @ 7:09 AM

reply profile send p.m.

Senior
Posts: 7271
Joined: Oct 2009

I like to check the push rod by measuring the travel. It should be about 1/4".

Low vacuum can also be caused by leaking input valves or a stretched diaphragm.

The new Airtex pumps that I checked last year would only hold 5" of vacuum, but would produce 10" on the car. I don't like them because the cup is so flimsy that it is hard to get it in place on the push rod.

Tom

supereal

07-29-2011 @ 9:59 AM

reply profile send p.m.

Senior
Posts: 6819
Joined: Oct 2009

In addition, some of the new replacement pumps have an "improved" linkage that doesn't seem to me to be of much benefit, unless I missed something. Like Tom, I find the rod cup to be flimsy, and the pump is best installed by pulling the stand, attaching the pump, and then setting it down on the rod. I usually put some heavy grease on the cup to hold it in the correct position as I lower it. If the cup isn't properly seated on the rod, the stroke, if any, will be greatly reduced.

Dolman

07-29-2011 @ 12:35 PM

reply profile send p.m.

New Member
Posts: 177
Joined: Dec 2010

I tried pulling up on the rod but something is preventing it from lifting all the way out. It comes up about 1/2 inch before it hits the resistance. Electrons are my friends but this hard mechanical stuff is alien. Bear with me MG, I am not using this forum as a plaything

07-29-2011 @ 12:45 PM

reply profile send p.m.

Senior
Posts: 1262
Joined: Nov 2009

Nice shot.....

35ragtop

07-29-2011 @ 1:39 PM

reply profile send p.m.

Member
Posts: 57
Joined: Aug 2010

Hi Dolman,I had this experience with my 35. I found upon removing the inlet manifold that the metal tube ( there has to be a proper name for it ) had been installed on the wrong side of the manifold. ie it had been inserted into the inlet manifold from the underside instead of the top. This prevented the push rod from coming all the way out.
The car ran fine like this with no problems.Interesting!
35ragtop

Dolman

07-29-2011 @ 2:01 PM

reply profile send p.m.

New Member
Posts: 177
Joined: Dec 2010

35ragtop, my '34 pickup was running fine too until the fuel pump and right distributor cap went toes up. I definitely want to measure the push rod but considering your experience it sounds like major surgery to correct the installation. (My brother would tell me I didn't have a big enough hammer.) Here's hoping that Supereal, TomO, or Stroker, to name a few of the guys that have been down the road and back with flatheads, will come up with a simple solution.

shogun1940

07-29-2011 @ 2:37 PM

reply profile send p.m.

Member
Posts: 464
Joined: Feb 2010

the cam lobe determines how high the push rod goes up and down so check that first

37RAGTOPMAN

07-29-2011 @ 5:49 PM

reply profile send p.m.

Senior
Posts: 1969
Joined: Oct 2009

Here is some info you might need,
the FUEL PUMP push rod length
48-9400-A 8.872 CAST IRON INTAKE 8 7/8
48-9400-B 7.872 ALUMINUM INTAKE 7 7/8
out of the GREEN FORD PARTS BOOK,
my 3cents 37RAGTOPMAN

<< previous || next >>

PAGE: 1 2

NOTE: YOU MUST BE A REGISTERED USER AND BE LOGGED IN TO POST (and reply to) messages in this forum. If you are a first time user, please click the CREATE A NEW ACCOUNT in the masthead above to register and Log In. After that, all you do is LOG IN to enjoy using this site.

DISCLAIMER: The V-8 Club does no independent testing of any of the opinions, thoughts or suggestions presented in the website on the Forum, in the Tech Tips section, or any section. A reader should consider the website to be a forum wherein differing solutions to a particular set of circumstances may be discussed. Ultimately, the selection of an item for an individual's vehicle must be based upon the independent study of the vehicle owner in consultation with people in the hobby and restoration experts.

Early Ford V-8 Club Forum

Merchandise Questions

Membership Questions