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Fuel pump volume test


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Hello. I’ll be helping a friend to diagnose a potential fuel pump issue this coming weekend. I have what I need to check the fuel pressure, and I have that spec (4-5 psi). However, I can’t find a spec for the pump volume. I’m aware of volume tests where you disconnect the line going to the carb and direct the flow into a container, then crank the engine for a certain amount of time and measure the volume. Does anyone know that spec for our trucks? 

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Don't think it's different but 12 pulses should be 6 to 8 ounces for p15s.  The service manual covers it in the test written procedure not on any spec chart. I may misremember stuff these days.  So please consider a second source.  Your results may vary.

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My 46-54 Plymouth manual says to disconnect at the carb and connect a short piece of hose to the line and place it into a container. Crank engine for 2 revolutions to prime pump and fill lines. Dump out the container and then crank engine for 15 pump strokes. You should get 5-6 ounces. 

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Thanks guys. This gives me a target to shoot for. As Robert said, this is not stated in the truck shop manual. It only references the pressure. And, in the test procedure it states 3-1/2 - 5-1/2 psi, but if you look in the Specs pages it shows 4-5 psi. (Gotta love inconsistency in service literature 🤔)  It’s good that the Plymouth manuals state it. I might do a test on my truck one evening this week for comparison/baseline. 

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14 minutes ago, Merle Coggins said:

I just performed the test on my truck. I got 4 oz. After 15 pump pulses. It would be a little low based on Ed’s spec., but it’ll hold 4.5 psi on a pressure test. So I’ll use this as a guideline too. 

I would think you're close enough there. When my truck's pump died I got about a tablespoon 

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1 hour ago, Merle Coggins said:

I just performed the test on my truck. I got 4 oz. After 15 pump pulses. It would be a little low based on Ed’s spec., but it’ll hold 4.5 psi on a pressure test. So I’ll use this as a guideline too. 

if it is as hot there as it is here, I would suspect it is evaporating faster than you can pump it....🌞

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2 hours ago, Young Ed said:

I would think you're close enough there. When my truck's pump died I got about a tablespoon 

Yes, close enough. Especially since my truck runs just fine with it. 
 

59 minutes ago, Plymouthy Adams said:

if it is as hot there as it is here, I would suspect it is evaporating faster than you can pump it....🌞

LOL… it’s actually nice here today. Low to mid 80’s with a nice breeze. 

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