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Old 05-18-2019, 10:59 AM
78-79fordman 78-79fordman is offline
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Default 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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  #2  
Old 05-18-2019, 11:03 AM
78-79fordman 78-79fordman is offline
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this is my second kit from 444fab also . other kit was a single Bosch setup but a may add a secondary pump to that kit also .

Last edited by 78-79fordman; 05-18-2019 at 11:13 AM.
  #3  
Old 05-18-2019, 11:40 AM
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Might be better off just letting both pumps run. Over complicating it
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Old 05-18-2019, 11:43 AM
78-79fordman 78-79fordman is offline
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will I have been told to only run one and have the other on a switch which would work but I would like it to come on with out me thinking to turn on a switch
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Old 05-18-2019, 01:36 PM
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You could just do one for now with the stock injectors
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  #6  
Old 05-18-2019, 02:02 PM
78-79fordman 78-79fordman is offline
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Quote:
Originally Posted by Magnum PD View Post
You could just do one for now with the stock injectors
that also maybe what happens . but which one I assume the bottom pump as the one check valve would keep it from pumping backward through the top pump right .
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Old 05-18-2019, 07:25 PM
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May already be a check valve
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Old 05-18-2019, 07:52 PM
Garbage_Mechanic Garbage_Mechanic is offline
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This is my exact plan for a fuel system as well. I likely do not need a second pump with 160/30’s. My thought is redundant backup. Problem is if the “spare” pump is never used it may not work when finally needed. Something has to excercise it. On landfill gas blowers we just switched to the other one every 30days. Guess I could just switch it every oil change. Thinking strongly of a fuel pressure switch to trigger secondary pump on low psi plus perhaps an excercise circuit like starter operation or glow plug activation causes pump to run. Or the KISS principle just put in a switch to select and switch it now and then....
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  #9  
Old 05-19-2019, 02:53 PM
78-79fordman 78-79fordman is offline
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Ya I was thinking add another pump to my other 444fab that's just one Bosch pump also even thought it wouldn't need but for if it failed
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Old 05-20-2019, 03:30 PM
78-79fordman 78-79fordman is offline
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Anyone got and thoughts on the pressure the switch would need to kick on the pump
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Old 05-20-2019, 10:54 PM
78-79fordman 78-79fordman is offline
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Any thoughts on this it would be open meaning turn the pump on tell it gets 60 or above the way I read . If I set my pressure at 65 which I have on my other truck would this be the pressure at I would the second pump on or off . Not sure this is fuel rated though.
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  #12  
Old 05-20-2019, 11:27 PM
EPA EPA is offline
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Quote:
Originally Posted by 78-79fordman View Post
Anyone got and thoughts on the pressure the switch would need to kick on the pump
Autometer elite gauges have out puts for this type of thing... You set low fuel pressure warning and can have it send an output signal to switch on the 2nd pump... They also look good.

Last edited by EPA; 05-20-2019 at 11:38 PM.
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Old 05-21-2019, 10:24 PM
78-79fordman 78-79fordman is offline
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Anyone see on that will work on this page starting at page 17 . I figure one around 60 psi that's adjustable.
http://stevenengineering.com/Tech_Su...DFs/77MAIN.pdf
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Old 05-22-2019, 07:40 AM
kip4234 kip4234 is offline
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my thoughts and how I have mine ran. I have two super duty pumps and run both at the same time. I did do separate power sources and fuses just so if one fuse would go or one pump went out and I was driving that nothing would go wrong or go out and I would make it home. I did this for two reasons one being I don't want to break down and the other reason I run two pumps is just for the additional flow.
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Old 05-23-2019, 08:05 PM
JCart JCart is offline
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A single pump not handle 238/xxx flow? I’ve done a number of DIY e pumps and logged thousands of miles and have used stock 7.3 pump (in fact used ones from wreckers) and a 6.0 pump. Have never let me down. Setting to do two more on current trucks, with stock 7.3 pump and will only use one pump per truck. Injectors aren’t huge so maybe that’s why they’ve lasted so well.

Used to keep a spare pump with me on long trips as they are easily swapped out, much less complicated and you’ll know pretty much if it fails.
j
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Old 05-23-2019, 09:09 PM
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I was going to go that route of a second intermittent pump and I came down to the idea of using a switch on the throttle pedal with an adjustable bracket. The pressure switch may work but it may also cause problems. Under a low pressure situation the pump would kick in. Bump pressure up. Hit the limit then power down and repeat causing unstabe pressure pulsations. I was going to use a small PLC and add in time delays etc but scrapped the idea as it was too complicated. The throttle activated is best in ky oopinion throttle demand say set for 70% and above pump kicks in and then back out of pedal pump off. Simple design and would work. A single SD pump will support 238CC injectors btw.
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  #17  
Old 05-23-2019, 09:36 PM
78-79fordman 78-79fordman is offline
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Quote:
Originally Posted by superpsd View Post
I was going to go that route of a second intermittent pump and I came down to the idea of using a switch on the throttle pedal with an adjustable bracket. The pressure switch may work but it may also cause problems. Under a low pressure situation the pump would kick in. Bump pressure up. Hit the limit then power down and repeat causing unstabe pressure pulsations. I was going to use a small PLC and add in time delays etc but scrapped the idea as it was too complicated. The throttle activated is best in ky oopinion throttle demand say set for 70% and above pump kicks in and then back out of pedal pump off. Simple design and would work. A single SD pump will support 238CC injectors btw.
Interesting switch setup any pics .
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Old 05-23-2019, 10:13 PM
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Same thing could be accomplished with a boost switch... Say you're fuel pressure drops off at 35psi... Once the boost switch/sensor reads 35psi pump comes on until you drop under 35... I had this set up on my talon.. Dual walbro 450 pumps... 2nd would kick on at 45 psi of boost... I later removed that switch setup and let my boost gauge send the output signal to the 2nd pump... Made it easy to adjust what psi i wanted it to kick on at.
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Old 05-23-2019, 10:17 PM
78-79fordman 78-79fordman is offline
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Quote:
Originally Posted by EPA View Post
Same thing could be accomplished with a boost switch... Say you're fuel pressure drops off at 35psi... Once the boost switch/sensor reads 35psi pump comes on until you drop under 35... I had this set up on my talon.. Dual walbro 450 pumps... 2nd would kick on at 45 psi of boost... I later removed that switch setup and let my boost gauge send the output signal to the 2nd pump... Made it easy to adjust what psi i wanted it to kick on at.
I do like the elite gauges it's a great option and I like the in the cab adjustability. The boost gauge could be better then the fuel pressure gauge as said above I worry about it on and off from the fuel pressure switching.

Last edited by 78-79fordman; 05-23-2019 at 10:19 PM.
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Old 05-23-2019, 10:44 PM
78-79fordman 78-79fordman is offline
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Ya on another forum a good idea was to install a light on the secondary pump relay so it would come on when it was on . Which is a great idea . It would also tell u if the secondary was running full time .
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Old 05-24-2019, 06:45 AM
Zeb Zeb is offline
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You guys are way over complicating it. Single good pump and be done.
Walbro GSL392X is probably a favorite of mine. I’ve used multiple ones, supports 600+ hp, and costs $135 so carry a spare if you want. I’ve got multiple trucks running them, and two of them have over 70,000 miles on them.
No need to complicate it with switches, check valves, and lights.
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Old 07-06-2019, 11:06 PM
78-79fordman 78-79fordman is offline
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So here's me thoughts I can see a possible problem with the fuel pressure activation. It could cause the pump to cycle on and off fast right if it picks the pressure up fast . Then it would kick off then pressure could drop fast then cause it to kick back on . Could this this cause a problem?

So I'm lean more to the boost activation using the autometer elite gauge as the in cab adjustabilit would be great plus running it through a on off on toggle switch so I could run the pump from the gauge or have completely off or run through keyed power as a manual on if I just needed even in a primary pump failure. Thoughts ?
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  #23  
Old 07-08-2019, 01:37 AM
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Nothing wrong with a manual over ride switch. You can go the route of boost activation for the second pump. I do see one issue with that. You can have high fuel demand with low boost. Such as the moments you mash the pedal down and the turbo is not spooled up yet. I personally would tie the second pump on demand to the throttle pedal. Simple to do. Build a bracket and mount a lever style limit switch. You can adjust it so the second pump is activated once the pedal is pushed down far enough. Say for example 60 or 70% throttle. You can even use MFD on a scanner to fine tune switch position.
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  #24  
Old 07-08-2019, 07:30 AM
78-79fordman 78-79fordman is offline
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Well I ordered the boost gauge yesterday and got a one off on switch. So we will see . Maybe there want be a low pressure before boost . Is so I will go to pedal switch . Some say the one pump will handle 238/80 fine . So at that maybe at boost will it ever need the secondary. And I will have the manual over ride in the switch.
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