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08-06-2007, 10:28 PM
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#1 |
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Registered User
Join Date: Mar 2007
Location: Chesapeake, Virginia
Posts: 39
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Fuel Pump Question
Hey, I have a 68 c10 w/ a 250. I am having a problem that I think may be due to hte fuel pump. When you take the fuel line off the carb, should there be a steady stream of fuel comming out with the engine running? Mine currently is pulsating and I think is starving the carb. Thanks
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08-06-2007, 11:05 PM
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#2 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Fuel Pump Question
that's how it is supposed to work.
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08-06-2007, 11:09 PM
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#3 | |
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Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: Fuel Pump Question
Quote:
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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08-06-2007, 11:09 PM
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#4 |
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Registered User
Join Date: Feb 2007
Location: Westfield, Tioga County) Pennsylvania
Posts: 113
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Re: Fuel Pump Question
If you run a line into a container such as an quart oil bottle, crank the engine over without starting. At a minimum a stock pump should pump about a pint of fuel in about 30 seconds or less. If you get less than a pint in 30 seconds, look for a restriction in the line such as dent or kinked line, pinched hose, or clogged fuel filter. Reconnect the fuel lines and perform a pressure test by installing a gauge near the carb and start the engine... should show 4 1/2 - 6 pounds of pressure for a 250. Stop the engine and note if the pressure... should drop off slowly... I pressure drops quickly, the outlet side of the pump may be leaking. If these checks are good and you feel the engine acts like it is starving for fuel, double check the ignition system. Good luck...
__________________
Ironhead Mike '68 Panel 402BB '84 Shortbox 4X4 '85 Blazer '97 Silverado Ext. Cab |
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08-06-2007, 11:13 PM
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#5 |
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Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: Fuel Pump Question
dont forget to check the lines for cracks and splits
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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08-06-2007, 11:27 PM
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#6 | |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Fuel Pump Question
Quote:
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08-06-2007, 11:31 PM
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#7 | |
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Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: Fuel Pump Question
Quote:
__________________
-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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08-07-2007, 06:57 AM
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#8 |
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Registered User
Join Date: Mar 2007
Location: Chesapeake, Virginia
Posts: 39
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Re: Fuel Pump Question
I appreciate everyones help!
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08-07-2007, 08:55 AM
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#9 |
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Active Member
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Fuel Pump Question
Pulses at low idle and may look like a stream at faster idling. That's how it works. A lever pushes against a diaphragm to create suction and pressure action...
Now, if you have a weak diaphragm, plugged sock in the fuel tank or restricted fuel lines (that's what my problem was) it will cause a weak stream. Fuel pumps are cheap and easy to replace if you suspect it. |
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