The Ford Barn

Mel Chapman · 10-06-2016, 01:48 PM

Fuel pressure is fine. gas flows to inlet on carburetor. needle valve free and clear, float moves just fine when top is off carburetor. Something is holding it up once it's put together. No scrape marks on inside of float bowl. runs for 2 minutes, then no gas in float bowl. Any brainy ideas? Thanks. Mel

V8COOPMAN · 10-06-2016, 02:05 PM

No brainy ideas yet, but PLEASE don't start a NEW thread if it pertains to the same subject. Too much can get lost in the scattered confusion. DD

19Fordy · 10-06-2016, 02:30 PM

Some thoughts.
Rebuild the carburetor making sure that the float and needle valve move very freely.
Install a new carburetor.
I would say there's something binding the float. Is it possible that the float is becoming unattached from its hinged point?
Do you have another carb you could take apart for comparison?
What year model engine and type of carb are you using?

FlatheadTed · 10-06-2016, 04:02 PM

Drizzle gas down as it runs and see if it keeps running ,this may tell you were to look next, Power valve leak down ? , Ted

Sixseven · 10-06-2016, 08:54 PM

A leak in the fuel line between the tank and the pump will cause it to suck air, not gas. Crazy idea, might check though.

19Fordy · 10-06-2016, 09:23 PM

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Good point. Do you have one of those little flexible rubber fuel line hoses on the firewall? Sometimes they clog up inside.

SofaKing · 10-06-2016, 09:51 PM

I just had a problem with a fuel pressure regulator between pump and carb intermittently shutting off fuel. I finally confirmed the fault by bypassing the regulator with a rubber hose. You might try a similar approach bypassing anything you suspect. Also, have you tried it with the gas cap off to verify vent is not clogged? Two minutes doesn't seem like enough fuel would be moved out of tank to cause problem but its easy and free to check.

Mel Chapman · 10-07-2016, 06:49 PM

All good things to check. Carb is rebuilt, float moves freely, no skid marks on inside of float bowl, no air leaks, no pressure regulator. I'll check the power valve, and I do have another rough looking carb to try on it. thanks for all the suggestions!

scrapiron · 10-07-2016, 07:45 PM

Your first post mentions a tank "coating", could some of that stuff be loose and sucked to the pickup ?
Rig another tank and see how it runs.

10-06-2016, 01:48 PM	#1
Mel Chapman Junior Member Join Date: May 2010 Location: California Posts: 8	No gas to engine still Fuel pressure is fine. gas flows to inlet on carburetor. needle valve free and clear, float moves just fine when top is off carburetor. Something is holding it up once it's put together. No scrape marks on inside of float bowl. runs for 2 minutes, then no gas in float bowl. Any brainy ideas? Thanks. Mel

10-06-2016, 02:05 PM	#2
V8COOPMAN Senior Member Join Date: May 2010 Location: East Shore of LAKE HOUSTON Posts: 11,113	Re: No gas to engine still No brainy ideas yet, but PLEASE don't start a NEW thread if it pertains to the same subject. Too much can get lost in the scattered confusion. DD __________________ *Click Links Below* __ ▼ *'35-'36 W/8BA & MECHANICAL FAN* *T5 W/TORQUE TUBE*

10-06-2016, 02:30 PM	#3
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,943	Re: No gas to engine still Some thoughts. Rebuild the carburetor making sure that the float and needle valve move very freely. Install a new carburetor. I would say there's something binding the float. Is it possible that the float is becoming unattached from its hinged point? Do you have another carb you could take apart for comparison? What year model engine and type of carb are you using?

10-06-2016, 04:02 PM	#4
FlatheadTed Senior Member Join Date: May 2010 Location: Auckland Posts: 4,705	Re: No gas to engine still Drizzle gas down as it runs and see if it keeps running ,this may tell you were to look next, Power valve leak down ? , Ted __________________ http://www.flatheadted.com Flathead Ted brake Floaters ,

10-06-2016, 08:54 PM	#5
Sixseven Senior Member Join Date: Jan 2014 Location: Atlanta, GA Posts: 482	Re: No gas to engine still A leak in the fuel line between the tank and the pump will cause it to suck air, not gas. Crazy idea, might check though.

10-06-2016, 09:23 PM	#6
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,943	Re: No gas to engine still Sponsored Links (Register now to hide all advertisements) Good point. Do you have one of those little flexible rubber fuel line hoses on the firewall? Sometimes they clog up inside.

10-06-2016, 09:51 PM	#7
SofaKing Senior Member Join Date: Jun 2014 Location: Salt Lake City, Utah Posts: 756	Re: No gas to engine still I just had a problem with a fuel pressure regulator between pump and carb intermittently shutting off fuel. I finally confirmed the fault by bypassing the regulator with a rubber hose. You might try a similar approach bypassing anything you suspect. Also, have you tried it with the gas cap off to verify vent is not clogged? Two minutes doesn't seem like enough fuel would be moved out of tank to cause problem but its easy and free to check.

10-07-2016, 06:49 PM	#8
Mel Chapman Junior Member Join Date: May 2010 Location: California Posts: 8	Re: No gas to engine still All good things to check. Carb is rebuilt, float moves freely, no skid marks on inside of float bowl, no air leaks, no pressure regulator. I'll check the power valve, and I do have another rough looking carb to try on it. thanks for all the suggestions!

10-07-2016, 07:45 PM	#9
scrapiron Senior Member Join Date: Sep 2010 Location: Independence, VA Posts: 423	Re: No gas to engine still Your first post mentions a tank "coating", could some of that stuff be loose and sucked to the pickup ? Rig another tank and see how it runs.