dual fuel pump - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 25 (permalink) Old 05-18-2019, 05:09 PM Thread Starter
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dual fuel pump

ok I went dual fuel Bosch pumps setup regulated return from 444fab . here's the pump setup in pics . I'm running stock injectors as of now but will be upgrading to 238/80 in the next couple months when I get the funds saved . starting with fuel since the stock pump started leaking .

so the questions

can I hook up the secondary pump to a pressure switch on the regulated return. if so what pressure should I make the secondary pump kick on . and in pics u can see the one way check valve is installed on the top pump . should it be the primary or secondary pump.
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post #2 of 25 (permalink) Old 05-19-2019, 02:58 AM
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Re: dual fuel pump

Since it's been 9 hrs, thought I'd poke my head in and give it a bump.

I have a theory that the pump with the check valve should be the secondary. If wired the other way I would think it would be trying to back flow into the first filter whenever only one pump is running. But I can't tell which way the check valve is in the pictures.

Nice setup BTW.

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post #3 of 25 (permalink) Old 05-20-2019, 03:29 AM Thread Starter
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Ya the bottom is the primary I have found out .
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post #4 of 25 (permalink) Old 05-20-2019, 04:01 AM
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Re: dual fuel pump

I always thought both pumps would need check valves?


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post #5 of 25 (permalink) Old 05-20-2019, 11:28 AM
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Re: dual fuel pump

I would run checks on both pumps personally. I like the idea of running the pressure switch but I think it's over complicating it.

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post #6 of 25 (permalink) Old 05-20-2019, 09:24 PM Thread Starter
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I would run checks on both pumps personally. I like the idea of running the pressure switch but I think it's over complicating it.
I don't really see how it would over complicate it second pump would still need something to trigger it there would just be a pressure switch in the trigger line wire
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post #7 of 25 (permalink) Old 05-20-2019, 09:25 PM Thread Starter
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I always thought both pumps would need check valves?
After think about it it would probably be a good idea as if one quit I could see it feeding backwards. Going to ask the builder 444fab
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post #8 of 25 (permalink) Old 05-21-2019, 03:58 AM
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Re: dual fuel pump

Thats what I thought, if either one quit, you don't want the good one to backfeed fuel? I would run check valves on both regardless.


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post #9 of 25 (permalink) Old 05-21-2019, 04:06 AM Thread Starter
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Thats what I thought, if either one quit, you don't want the good one to backfeed fuel? I would run check valves on both regardless.
I wonder if check valves are restricted at all. U know like the stock selector valve
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post #10 of 25 (permalink) Old 05-21-2019, 04:10 AM
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Re: dual fuel pump

They probably are, but no sense in running one pump with a restriction and the other open, you would wear the restricted pump out faster working it harder.

I'm sure they can't restrict that much anyways.


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