Merle Coggins Posted July 8 Report Share Posted July 8 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? Quote Link to comment Share on other sites More sharing options...
greg g Posted July 8 Report Share Posted July 8 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. Quote Link to comment Share on other sites More sharing options...
Robert Harrison Posted July 8 Report Share Posted July 8 I took a look at this and the attachment is what I came up with. I could not find volume in the Dodge truck shop manual. Comments are welcome. Bob Harrison Fuel pump volume.doc Quote Link to comment Share on other sites More sharing options...
Young Ed Posted July 8 Report Share Posted July 8 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. 1 Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted July 9 Author Report Share Posted July 9 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. Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted July 10 Author Report Share Posted July 10 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. Quote Link to comment Share on other sites More sharing options...
Young Ed Posted July 10 Report Share Posted July 10 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 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 10 Report Share Posted July 10 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....🌞 Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted July 10 Author Report Share Posted July 10 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. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 11 Report Share Posted July 11 low to mid 80's sound closer to cost to fill my gas tank... Quote Link to comment Share on other sites More sharing options...
rustyzman Posted July 22 Report Share Posted July 22 1/2 gallon per minute running is the basic standard for any stock gasoline engine. Assuming you can get it running of course. Carb or EFI is the same, just operating at different pressures. The old SUN fuel pump gauges had a spring clamp on a bypass hose to check it. Later EFI gauges also had a bypass button for it. This is the standard we used in the shops and whatever service data we could find from different manufacturers generally agreed. Quote Link to comment Share on other sites More sharing options...
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