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EFV-8 Club Forum / General Mercury Discussion / fuel pump

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Peder D
10-11-2017 @ 12:12 PM
Member
Posts: 95
Joined: Oct 2009
          
Hi! I have a fuel pump with the glass bowl in my '46 Mercury. I bought this back in 2005 from Joblot, I believe. Not many miles on the car since overhauling back 2010.
Problem is that the fuel level in the bowl is reduced when the car has not been started for a while. I can see no leaks, the flexible line close to the firewall seems ok and not to old, there's plenty of gas in the tank, and I have recently replaced the seal between the bowl and the pump with cork seal. The start is at best difficult. What seems to be the problem? Thanks, Peder

ken ct.
10-11-2017 @ 2:51 PM
Senior
Posts: 1513
Joined: Jan 2010
          
For 1 thing the glass bowl pumps never came out till the 47 models. It will work but not correct for 46. The gas in the carb bowl should last roughly above that its mostly evaporates. If less than that your power valve or gasket is leaking gas into the crankcase. Smell your dipstick for gas. 2 weeks it will evaporate after that. I have correct 41 to 46 all metal have 1 left and show rebuilt with bullet proof diaphragm and valves for info call Ken Ct. 1-203-260-9780

TomO
10-12-2017 @ 1:06 PM
Senior
Posts: 7243
Joined: Oct 2009
          
Peder,

If the glass bowl is less than full, the bowl gasket is probably leaking. The new gasket may solve the problem, but if someone over-tightened the bowl nut, they may have bent the seating area and the pump should be replaced. The glass bowl nut is supposed to be finger tight and you should not be able to rotate the glass bowl.

Tom

42oink
10-13-2017 @ 12:40 PM
New Member
Posts: 119
Joined: Nov 2010
          
Hi Peder, I'm sure someone will correct me if this doesn't make sense, but could an air leak farther along toward the carb be allowing the gas to siphon back to the tank? How long does it set when you notice the level going down? Seems to me, even if the bowl gasket was not seating the gas would at least stay in the bowl. What if the fuel float valve wasn't seating. Would that allow air back to start it siphoning? Just a thought. What does anybody think? 42oink.

Peder D
10-15-2017 @ 10:01 AM
Member
Posts: 95
Joined: Oct 2009
          
Thanks to all for your replies...got a hold of my mechanic friend who has been tooling around with Early Fords for 50 years +++...and who has taken care of most of my problems with the Mercury...he had an original and correct pump for the '46 which he had overhauled...we installed that along with a new original Ford hose to the pump. Didn't take long before the old gal started right up....we haven't determined whether the glass bowl pump was the culprit, but the hose definitely needed replacing...Peder

TomO
10-16-2017 @ 7:53 AM
Senior
Posts: 7243
Joined: Oct 2009
          
Peder, In the USA we stay away from new old stock flex gas lines as they are not resistant to the Ethanol in our gas. If your gas also has Ethanol added, you may want to source a new line from the USA.

Tom

blarge
10-18-2017 @ 6:14 PM
Member
Posts: 94
Joined: Oct 2009
          
Ken: Do you have a rebuilt fuel pump for a 46 Ford 1/2 ton pick up I can buy? If not, will you rebuild the one I have? Thanks, Bill Large 586-677-4790 Michigan

Peder D
07-04-2018 @ 6:13 AM
Member
Posts: 95
Joined: Oct 2009
          
TomO: Found the problem to my lack of sufficient fuel to the gas pump...turns out...the push rod had been "shortened" after 72 years, so the pump wasn't up to its job...anyone else experience the same? Anyway, "new" push rod in, and the ol' gal came back to life...was advised not to use a NOS flex gas line...any idea where to "source" a new line in the U.S.? Thanks, Peder

39 Ken
07-05-2018 @ 3:52 AM
Member
Posts: 380
Joined: Oct 2009
          
Peter, Bob Shewman makes and sells a new Fuel flex line identical to the original but with new material that is compatible with the fuels of today. A superior product and I have used three so far.
Bob can be reached at:

gadgiteer@aol.com

or by phone at 610-933-6637.

len47merc
07-07-2018 @ 8:15 AM
Senior
Posts: 1165
Joined: Oct 2013
          
With all due respect and appreciation for ken ct - just to clarify the 'correctness' of a glass bowl pump on a '46, glass bowls were implemented in late '46 (mid-to-late November from my research) and can be found both in late '46's and all '47's. Many late '46's DID have the glass bowls, and many very early '47's have '46 serial numbers but were not finished off the assembly lines and titled until Jan-Feb '47 (ask me how I know). This has been validated with me and endorsed by EFV8 technical advisors as well as knowledgeable judges at meets. Additionally, this is borne out in Appendix D Evolutionary Changes for 1941-48 Ford Passenger Vehicles on page D-3 of the 1941-48 Ford Book.

Bottom line is if you have a mid-to-late 4th quarter '46 serial number 59A or AB engine car and it has a glass bowl you have a compelling position to take that it is technically correct. If it is an earlier than November '46 car and it has a glass bowl and you are keen on originality then a pump without the glass bowl is more likely and technically correct (you might have a difficult time selling the story to a judge otherwise).

Steve

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