NA fuel rails

Nissan 300ZX technical discussion forum: Maintenance, performance, installations, modifications, how-to's and troubleshooting.
Fireopal7
Posts: 13
Joined: Tue Apr 08, 2014 11:56 am
Car: 1990 300ZX N/A

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I'm upgrading my fuel injectors early to new style. I was longingly checking out the 300 degree rails when I read that they can be hooked up in series (oem style) or in parallel to insure fuel flow to #6 injector. I've figured out how to plumb the stock rails with barbed 3 way splitters. I know this is probably overkill for a NA 300, but WTF. Any body out there done this? My only concern is a loss of pressure that would be like series versus parallel batteries. I don't know if fluids behave in the same way electricity does. So, if anybody did the parallel route on a high output engine, did you lose pressure? Not looking for HP, just don,t want old #6 to come up short. These engines are complicated enough without adding more hoses, but I thought this might be cool. Thanks for replies.


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Ace2cool
Posts: 11650
Joined: Sun Apr 20, 2008 5:21 pm
Car: 1991 Nissan 300ZX TT
1966 Datsun Fairlady 1600
2005 Suzuki GSX-R 600
1974 Honda CB550 Four
2009 Ford F150 Lariat
Location: Murfreesboro, TN

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So, your plan would be to pipe them with what is essentially crossfeed on all the injectors? like, 1 & 2, 3&4, 5&6 all tied together?

You're right about sounding like overkill on an N/A though. I don't see the need for it. Still, cool concept.

Fireopal7
Posts: 13
Joined: Tue Apr 08, 2014 11:56 am
Car: 1990 300ZX N/A

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More like, run 1 source/fresh fuel hose thru fuel pressure regulator to front of rails and split flow between the 1 3 5 and 2 4 6 rails then splice the what would now be the return fuel lines on rear of each rail into 1 hose going thru fuel damper to fuel tank. A cleaner install would be to use air compressor manifolds I saw at Menard's since my original post. They are even anodized red aluminum, much better looking than brass Y/3 way fitting. Almost everything would look stock from above with AC manifolds under the upper plenum bolted to lower plenum. The ends of the barbed metal lines on the front of the fuel rails are very close together and would need to be modified (the hose that connects them is very short). Not the Quickest Reply, but I thought I would let original post perk for a while to get max replies,guess you were the only one interested. If this is still clear as mud, send physical address and I'll snail mail you a picture/diagram. I'm not very computer savvy and can't send photo/picture emails. Thanks for reply, T Baker

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Ace2cool
Posts: 11650
Joined: Sun Apr 20, 2008 5:21 pm
Car: 1991 Nissan 300ZX TT
1966 Datsun Fairlady 1600
2005 Suzuki GSX-R 600
1974 Honda CB550 Four
2009 Ford F150 Lariat
Location: Murfreesboro, TN

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I see what you're saying now. Yeah, it's possible, and in theory it sounds like it would work well, but I would agree with you on it being overkill. I've actually never heard of an N/A starving for fuel or having issues feeding to any cylinders, even modified.


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