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Old 09-26-2015, 09:54 AM   #1
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fuel Manifold

hi don't know if there is any experience fuel manifold specialist could help me design a fuel manifold material is not a problem just want to design something simple

this is what I have

2 tank AFT & FWD each tank have 1 feed only
2 pump AC and DC

what I would like to do is to have the AC pump suck and transfer to either tank
Likewise the DC pump to suck and transfer to either Tank

if I get a drawing I can follow the instruction

thanks in advice busting my brains here trying to figure it out and make it simple
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Old 09-26-2015, 11:53 AM   #2
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Sounds like you need two log manifolds. One to select which tanks the pumps are drawing from and one to determine where the fuel is going to go.

Each manifold would either have a 3 way or separate valves for each pump to select which pump you want to use to move the fuel around. Along with valves to each tank.

Your tanks have no fuel return lines to them?
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Old 09-26-2015, 12:31 PM   #3
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What is the point of an AC pump?
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Old 09-26-2015, 01:39 PM   #4
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What is the point of an AC pump?
Redundancy. And in many cases AC pumps have a higher flow rate than DC pumps. Are my guesses.
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Old 09-26-2015, 04:42 PM   #5
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Sounds like you need two log manifolds. One to select which tanks the pumps are drawing from and one to determine where the fuel is going to go.

Each manifold would either have a 3 way or separate valves for each pump to select which pump you want to use to move the fuel around. Along with valves to each tank.

Your tanks have no fuel return lines to them?
exactly if you could throw me a sketch
no they have no return just one line to each tank that make it more difficult
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Old 09-26-2015, 04:43 PM   #6
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Redundancy. And in many cases AC pumps have a higher flow rate than DC pumps. Are my guesses.
yes you correct
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Old 09-26-2015, 05:07 PM   #7
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Ok, so why do you need a high-volume pump on a fuel manifold?

Not trying to be difficult but I see this system as not being built yet, but it's already on the wrong track.
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Old 09-26-2015, 11:27 PM   #8
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The Reverso pump companie makes some really nice fuel manifolds. I'm going to use one on my boat. If you buy one, get it from a dealer. It'll be less expensive than from the Reverso website.
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Old 09-27-2015, 01:08 AM   #9
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ok hop car will check it out just curious how to pipe it
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Old 09-27-2015, 03:37 AM   #10
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Ok, so why do you need a high-volume pump on a fuel manifold?

Not trying to be difficult but I see this system as not being built yet, but it's already on the wrong track.
What are the negatives to having a high or higher volume pump? Not that we know even if the pump in question is particularly high volume.
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Old 09-27-2015, 07:31 AM   #11
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Reverso has a number of system ideas on there web site.

Just copy what you think you require with your pieces..

And remember its best to SUCK thru a fuel filter than pump thru it.
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Old 09-27-2015, 11:04 AM   #12
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Go on Yachtworld and look at listings for Defever 44, 49 and 50. They all have very good fuel manifolds. I'd post a pic of mine but for some reason I can't post from my iPad.
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Old 09-27-2015, 11:10 AM   #13
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A proper fuel manifold is something that's patently missing on Stillwater. Building one is on my to do list. Finding somewhere suitable to mount it is also on my list!

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Old 09-27-2015, 11:16 AM   #14
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Are your pumps reversible?
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Old 09-27-2015, 11:31 AM   #15
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Go on Yachtworld and look at listings for Defever 44, 49 and 50. They all have very good fuel manifolds. I'd post a pic of mine but for some reason I can't post from my iPad.

Not mine, but a typical Defever manifold setup.

[/URL
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Old 09-27-2015, 11:37 AM   #16
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The fuel should flow by gravity and the only pumps needed are the on-engine pumps or perhaps a small rattle-pump for priming fuel filters etc. What purpose does an AC pump provide in a fuel system? My previous boat and my present one had their fuel delivered by gravity, I could select from either tank both for feed and return (but never did as the fuel sought it's own level) and I had a rattle pump to fill the filters and bleed the engine system, only used for filter changing but I got a second Racor so didn't use it much, if at all). One small DC pump, no AC pump.

I'm still curious why an AC pump is considered a necessity? What will you do with it?

I am of the opinion that on-board polishing systems are a huge waste of time and money (you need a giant pump that is capable of moving enough fuel to stir up the crud in the bottom of the tank so it can be filtered and if you DO have crud, you need to solve the problem instead of playing with pumps and filters) as a simple sump drain is a better way to go.

We cross-posted, that Defever picture is scary. I would add two more Racors so you could switch filters without shutting down any engines and I'll bet none of those valves are used except to isolate the filters for changing elements. I would also remove the genset from those manifolds (if one is actually plumbed into it) to ensure no single point of failure.
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Old 09-27-2015, 12:08 PM   #17
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Go on Yachtworld and look at listings for Defever 44, 49 and 50. They all have very good fuel manifolds. I'd post a pic of mine but for some reason I can't post from my iPad.
if and when u can can you post so I can get some idea
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Old 09-27-2015, 12:10 PM   #18
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Are your pumps reversible?
yes its reversible was thinking about if there was a 2 way switch n if possible to wire it never seen it done before
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Old 09-27-2015, 12:13 PM   #19
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fuel Manifold

Here's ours, it's all welded stainless.
Click image for larger version

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That timer to the left is for the polisher/transfer pump.
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Old 09-27-2015, 12:16 PM   #20
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The fuel should flow by gravity and the only pumps needed are the on-engine pumps or perhaps a small rattle-pump for priming fuel filters etc. What purpose does an AC pump provide in a fuel system? My previous boat and my present one had their fuel delivered by gravity, I could select from either tank both for feed and return (but never did as the fuel sought it's own level) and I had a rattle pump to fill the filters and bleed the engine system, only used for filter changing but I got a second Racor so didn't use it much, if at all). One small DC pump, no AC pump.

I'm still curious why an AC pump is considered a necessity? What will you do with it?

I am of the opinion that on-board polishing systems are a huge waste of time and money (you need a giant pump that is capable of moving enough fuel to stir up the crud in the bottom of the tank so it can be filtered and if you DO have crud, you need to solve the problem instead of playing with pumps and filters) as a simple sump drain is a better way to go.

We cross-posted, that Defever picture is scary. I would add two more Racors so you could switch filters without shutting down any engines and I'll bet none of those valves are used except to isolate the filters for changing elements. I would also remove the genset from those manifolds (if one is actually plumbed into it) to ensure no single point of failure.
I understand what you are saying and you are right however not sure if my post was mi-read ac and dc pump not for engine its for transferring from one tank to the other, leveling/balancing both tank
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