(800) 853-2651
SHOP NOW

Odd Ford 640 issue.

grandpa Love

grandpa Love

Well-known Member
Seen many posts set on here about tractors that run for hour or 2 then have issues. Well it's my turn. Coil was so hot you couldn't touch it. Changed it all seem good. But......vented gas cap wasn't so I drilled a small hole in it , solved that issue but when I got off to make sure pressure wasn't building up I looked down in tank and there was bubbles coming up from bottom. Sorta burps of bubbles. I thought gas was boiling but I stuck a stick in and gas was cool. So what made it bubble? I could tap on sediment bowl and make it bubble.
Untitled URL Link
 
(quoted from post at 18:11:15 10/18/17) Seen many posts set on here about tractors that run for hour or 2 then have issues. Well it's my turn. Coil was so hot you couldn't touch it. Changed it all seem good. But......vented gas cap wasn't so I drilled a small hole in it , solved that issue but when I got off to make sure pressure wasn't building up I looked down in tank and there was bubbles coming up from bottom. Sorta burps of bubbles. I thought gas was boiling but I stuck a stick in and gas was cool. So what made it bubble? I could tap on sediment bowl and make it bubble.
Untitled URL Link
Click to expand...

How does the stick tell the temperature? The methanol in the gas will boil at 173 degrees which will cause the bubbles that you are seeing., yet both the methanol and the gas will evaporate at much lower temperatures. Evaporation sucks up heat which makes the liquid feel cool. There is supposed to be a sheet metal baffle between the muffler and the tank to keep the tank from getting too hot.
 

bubbling from the bottom of tank, or bubbling from where the fuel line comes in to the tank...

Could be fuel line routing is incorrect and too close to exhaust or rear of engine.
 
Heat shield is there. Didn't have
a thermometer ,and I figured gas
was hot , that's where stick comes
in. So if it's bubbling ,gas is
boiling?
 
It's bubbling where fuel valve is
in bottom. Gas line runs right
behind manifold. May try running
it around the front. Did that on
my 960.
 
Is the fuel line steel?

Sometimes they get replaced with copper. Steel is less heat conductive, less likely to boil in the line. That's where the term "vapor lock" came from.
 
Not sure. Will check in am. When it bubbles tractor runs poorly, pulling choke helps. After it cools off a few minutes its back to normal.
 
Grandpa love- Dang Dude, you seem to have a lot of problems with that 640. I really like the hundred series Fords.
 
Mine bubbles from the fuel line in bottom of tank. Fuel line is rubber and goes around front. Started this after changing intake/exhaust manifold. Original was broken at elbow where exhaust elbow bolts on. Heat sheild is in place. Tractor runs fine.
 
the bubbling of gas in the tanks above the engine is very common to-20s and 30 Ferguson's do it all the time have 5 and they will all do it if worked hard in hot weather no big deal
 
I know. Stupid cheap project! I think I have it sold. Guy coming Saturday. Been fun learning. Glad our 2 fords run right. Most of the time!
 
What about the cutting out when it
bubbles? Choke smooths it out for
a few minutes ,then it dies and
has to cool off.
 
This comes up often and is discussed down on the Ford Forum.
a175625.jpg

a175629.jpg

Poke here
 
When I got my 960 the fuel line was steel, rubber, copper, rubber, steel in line filter ,mess. I got steel brake line and ran a new line around the front. Working great. Now I get to do the 640,wanna fix it before I sell it. Ain't right to give someone else an issue.
 
I had an AC D10 I used to mow hay,after ethanol gas came on the scene it would start to miss and cut up after running 30 to 60 minutes on a hot day.Took the hood off to work on it
to try to find the problem on a hot day went back to mowing without the hood and it never started missing.Apparently the gas in the tank under the hood was getting hot enough to vaporize
and make the tractor miss.
 
My 801 would bubble up from the fuel line in the hot summer time. I switched to non-ethanol gas, insulated the fuel line with this silver coated insulating cloth stuff from Summit Racing, and made sure my radiator stayed clean. One or all of that fixed it. The bubbling used to be violent. Kind of spooked me.
 
You must log in or register to reply here.

Similar threads

B
1964 Ford 2000, electronic ignition dies after 30 seconds
Replies
11
Views
337
Benartm80
B
Superbros8
Ford 4000 poor running when warm
2
Replies
35
Views
847
Superbros8
Superbros8
J
Ford 640
Replies
2
Views
251
showcrop
showcrop
jon f mn
Engine issue solved
Replies
7
Views
357
showcrop
showcrop
super99
Disappointing afternoon
Replies
10
Views
2K
Tgrasher
Tgrasher
Tractor Parts Tractor Manuals

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 © 1997-2024 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