The Ford Barn

Ford coupe · 08-02-2012, 02:29 PM

When i put a clear plastic hose on the gas line after the filter about 8 inches from carb on my 55 272 cu in it takes about 20 seconds before fuel starts to comefrom my eectric pump and even then almost no pressure..When fuel comes it seemto come in spurts like 6 in of fuel then an air bubble about an inch long another 6 in fuel another air bubble...The same type pump works great on my 36 flattie but the one on the 55 does not help for starting and it is installed as on my 36..Both are Macs pumps THNKS in advance Ford coupe

40cpe · 08-02-2012, 04:07 PM

I would first disconnect the hose from the carb and put it in a container and run the pump to check output. If you are pushing fuel through a mechanical pump, disconnect on suction side of pump. If it is still inconsistent, look for air leak between pump and tank. The pump should be mounted lower than and close to the tank. Next, install rubber hose from suction side of pump to fuel in container and run/check again. You have to eliminate as many possible causes as you can to isolate the pump to see if it is defective

Y-Blockhead · 08-02-2012, 04:24 PM

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Sounds like you may be sucking air thru a hole in the fuel line from the tank or the pickup in the tank has a leak. 40cpe outlined a good way to check.

08-02-2012, 02:29 PM	#1
Ford coupe Senior Member Join Date: May 2010 Location: Napanee ontario Canada Posts: 395	%% electric p ump When i put a clear plastic hose on the gas line after the filter about 8 inches from carb on my 55 272 cu in it takes about 20 seconds before fuel starts to comefrom my eectric pump and even then almost no pressure..When fuel comes it seemto come in spurts like 6 in of fuel then an air bubble about an inch long another 6 in fuel another air bubble...The same type pump works great on my 36 flattie but the one on the 55 does not help for starting and it is installed as on my 36..Both are Macs pumps THNKS in advance Ford coupe

08-02-2012, 04:07 PM	#2
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,024	Re: %% electric p ump I would first disconnect the hose from the carb and put it in a container and run the pump to check output. If you are pushing fuel through a mechanical pump, disconnect on suction side of pump. If it is still inconsistent, look for air leak between pump and tank. The pump should be mounted lower than and close to the tank. Next, install rubber hose from suction side of pump to fuel in container and run/check again. You have to eliminate as many possible causes as you can to isolate the pump to see if it is defective

08-02-2012, 04:24 PM	#3
Y-Blockhead Senior Member Join Date: Jul 2011 Location: Redondo Beach, CA Posts: 5,849	Re: %% electric p ump Sponsored Links (Register now to hide all advertisements) Sounds like you may be sucking air thru a hole in the fuel line from the tank or the pickup in the tank has a leak. 40cpe outlined a good way to check.