Fuel Pump Placement Question for EFI/external pump

[FLFrank35]

I'm running a Holley Sniper EFI with an external pump. The Sniper instructions say the pump "must be below the lowest part of the fuel tank." The problem with the truck frame is that the tank is so low, there's no place to mount it below the tank.

I've noticed in most pictures, guys have mounted it at, or above, tank level. Do most people mount it high without performance problems?

I'm wondering if that requirement is for other setups. I could call Holley next week...just want to get it done this weekend.


Side note: I originally installed the in-tank pump/bracket, which has a small return barb, but learned that the larger 6 AN return is preferable. So I removed the in-tank pump/bracket and modified the other bracket with a 6 AN fitting and planned to use the external pump until I came across the mounting requirement. Now not so sure :confused:

Frank

[wallace18]

Frank, I buy a fuel pump setup from Rockauto for a 94 Mustang that fits right in the tank. There are choices to fit your need. The external one is a PITA unless there is no in tank available, IMO. You can use the FFR setup all the way to the supplied fuel filter. Then use steel lines or your 6AN stuff. I have done several builds this way with no issues.

https://www.rockauto.com/en/moreinfo.php?pk=872483&cc=1134188&jsn=2097&_nck=ZExt1ysfqhqWnq%2BEvUNdS3Txyey60IDtnjPWF5UU9J0 BWQv7pvqZbkEUk86%2BAYIh3BPX4eQfsOiEcSO3wdrfRV%2BHG GCg2DVbzGVo1MM%2FPBR4p4PuTVmNYEa2PqmZ3OZaL43O5WDRa v5B0NP3sCE%2BBWw8rih6AIz3jtn7ELsFASfC6kTHQKikBPdJW AFHhGu%2BIs9usaGaNrmIIlIlgnZV7PGykWZnI2BaA4tQbK93h 6Zf3dKe1beFy4PlHGexCa3o6KNeJnBnvjr4o10vZGDsAH1ny2i RARZLwte4fBPznNXpObGefFgK1Tw3dMsZoHaVyyP4GQNYd6B4p RuQWvnloHb7uifieaDZ

[Cobradavid]

Another vote for using an in-tank pump. We put a FiTech EFI on the 302 in my daughter's '66 Ranchero and had many problems with the external fuel pump - even when mounting it close to the tank (less than 3' of fuel line) and below the lowest part of the tank. it was VERY noisy (probably was cavitating) and never provided enough pressure and flow for a totally stock 302.

https://thefactoryfiveforum.com/showthread.php?28988-Declaring-success-New-SBF-w-FiTech-EFI-hesitation-sputtering-problem-solved!


We decided to get an in-tank pump kit to put in the Ranchero's tank. No problems since.

David

[FLFrank35]

Thanks for the recommendations! This one https://www.highflowfuel.com/i-35467013-quantum-an-fitting-fuel-pump-hanger-6an-6an-for-1986-1997-ford-mustang-without-pump.html
was recommended to me also. It has 6 AN fittings welded to the feed/return tubes. I think I may go with this to keep things simple.

126704

Thanks again!

[NAZ]

Frank, there are advantages in using a submersible pump (in tank pump) that outweigh what seems like the simplicity of an external pump. If this is a moderate powered street car I'd recommend installing the pump in the tank. Regardless which style you use, you first must determine the size of the pump, i.e. flow required at a specific pressure. There are many calculators on the internet to help with this, here is just one: https://www.raceworks.com.au/calculators/fuel-pump-calculator/ And, BTW that -6AM tubing / hose will support around 600 HP.

On my race car, I use an external pump and can tell you it's louder than most cars exhaust at idle. But for my application (>1100 HP) this style pump makes sense, but not so much for a street car especially a modest powered one.

[FLFrank35]

NAZ, thanks for the insight and the link! That is inline with what I am learning. I like the idea of the in-tank lower sound levels and pushing fuel directly from the tank.

Frank