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Fuel line routing with twin pumps

Old 03-14-14, 12:39 AM
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Fuel line routing with twin pumps

Just put in some full function primary and secondary rails, along with some ID 1000 primaries and ID 2000 secondaries. I was looking at my options for fuel line routing to see if theres anything better I can do than go in series. I was looking at this, but it doesn't really make a lot of sense. I'm going with twin fuel pumps also. I don't see the point in going from a 3/8" line from each pump, into a Y to a 1/2" line. That seems like it'd be a restriction. Can I just run a line off each pump? One line going to my primary rail, one going to my secondary, then to each side of my A1000 aeromotive FPR? And secondary out the bottom? Less restriction, more flow.



How I'm looking at it, with a filter and all necessary fittings and everything of course.

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Old 03-14-14, 11:05 AM
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Problem with one pump per rail is that the rails don't have the same injectors.

Honestly, if I were you I'd T the pumps and run a 1/2 inch line. Makes way more sense. The funny thing about these cars is that for the majority of builds, one pump is just a little less fuel than would be required so you get another one and now you have way more than you'd probably need. Still need the second pump technically but it's just way more than you actually need and there's no way around it. Except for insane builds obviously but yeah.
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Old 03-14-14, 11:06 AM
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Oh the point with the last bit about the 2 pumps probably being a bit overkill (but still necessary) is that I wouldn't be worried at all by whatever restriction a Y in the line causes.
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Old 03-14-14, 11:47 AM
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Originally Posted by Mitchocalypse View Post
Problem with one pump per rail is that the rails don't have the same injectors. Honestly, if I were you I'd T the pumps and run a 1/2 inch line. Makes way more sense. The funny thing about these cars is that for the majority of builds, one pump is just a little less fuel than would be required so you get another one and now you have way more than you'd probably need. Still need the second pump technically but it's just way more than you actually need and there's no way around it. Except for insane builds obviously but yeah.
Oh i get you, but why does it matter if the rails have different injectors? But why not make the most out of the 2 pumps if your gonna take the time to put em in? Its just like you could have more if you ever need it later, and youll never have to mess with it anymore. Sorry for all the questions but im just curious haha. I get what you mean about one is almost enough and the second is just that extra little push you need but why not use all of what you have?
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Old 03-14-14, 12:18 PM
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You can't use all you have. You only use what you're tuned for so I guess it doesn't really matter
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Old 03-14-14, 12:20 PM
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Sorry I'm posting from my phone, didn't mean to submit this
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Old 03-14-14, 12:23 PM
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And about the different sized injectors, I guess it doesn't really matter so long as each rail has sufficient fuel supply. But merging the two pumps is just way more common.

Also cheaper.. Line is fairly expensive. Although so are some of the fittings
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Old 03-14-14, 02:30 PM
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I have twin walbro pumps intank using the CJ hanger. The problem with one pump per rail is that if one pump FAILS then you just lost fuel for the entire rail which could be catastrophic. So...I have a Y connection about a foot after the fuel tank which leads to a good aftermarket filter; I'm running -8 AN Hose after the Y. Then at the engine bay I put another Y but with -6 AN to each rail and then each rail to the Fuel regulator.
Attached Thumbnails Fuel line routing with twin pumps-fuelrouting_zpsf6a7650c.png  
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Old 03-14-14, 03:29 PM
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Originally Posted by ondabirdhouse View Post
I have twin walbro pumps intank using the CJ hanger. The problem with one pump per rail is that if one pump FAILS then you just lost fuel for the entire rail which could be catastrophic. So...I have a Y connection about a foot after the fuel tank which leads to a good aftermarket filter; I'm running -8 AN Hose after the Y. Then at the engine bay I put another Y but with -6 AN to each rail and then each rail to the Fuel regulator.
Same for me except I have a different pump setup. But that's the best way I think is one line, splitting into 2 at the rails
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Old 03-16-14, 06:20 PM
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I prefer to run the rails in parallel with one pump per rail. Get an AEM failsafe wideband and set it up to cut boost is the afrs go lean.
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