Holley Sniper in-tank pump, return line?

[1974scamp]

Hello all,

I just installed a Holley 12-319 in-tank fuel pump for my sniper 1. As I had a in-line 044 style pump in the car I do already have a return line installed in the car leading back to the filler neck.

Now ive read that some people that needed to run a pulse damper when they were not running a return line, while otheres still recommend running a return even with this pump but how would that work as its normally not needed with that pump (also a reason why i got it, i like the idea of only one fuel line).

Or shall i just install it and see if the pulse damper is really needed later?

Thanks for your opinions!
Laurin

 

[Rocket]

Did you contact Holley for their recommendation? Curious to know what the manufacturer says.

 

[RealWing]

I have a single line. I decided to install a damper based on what I’ve read. but haven't fired it up yet.
Jim

 

[1974scamp]

Did you contact Holley for their recommendation? Curious to know what the manufacturer says.

Holley just recommends a single line without anything

 

[1974scamp]

I have a single line. I decided to install a damper based on what I’ve read. but haven't fired it up yet.
Jim

Which one do you have? Do you maybe have a picture? Thanks

 

[RealWing]

It is a Marren #0201. This is where I installed it. A lot of fittings, but I wanted to get it tucked under the air cleaner base.

 

[1974scamp]

Ok i installed the in-tank pump this weekend and fired it up first time, the pump itself is really a nice piece and is barely noticable when the engine is running (100 times quieter than the 044 pump i had before) so thats really nice.

The injectors up front are way louder now (compared to the having the return line) and the fuel supply hose is really pulsating, i had no fuel pressure gauge attached but while revving the engine leaned out and sometimes stalled, in the video link you can really hear the injectors: 20250214_173038.mp4

So i think ill get this in-line fuel damper as i read good things about them and hope it will work then and calm everything down, just dont know where to put it yet:

 

[MV8]

That pump has a regulated return inside the tank. A regulator at the injectors would allow you to adjust for pressure drop from your plumbing. If the pressure is under 55 psi at the injectors, upgrade your feedline (larger od and larger radius bends), filter, or fittings (no banjos or elbows unless long"full flow"). Adding a return without defeating the internal regulator won't help.

Single and dual line can benefit from a pulse damper but I doubt it would make a noticeable difference, imho.

 

[jbc426]

I bought an aftermarket fuel sending unit with the 3/8' feed and 1/4" return bungs. I carefully removed the 1/4" bung, enlarged the hole with a step bit, and silver soldered a steel 3/8" line in its place. Finding real silver solder was the hardest part of the modification. Located it at a local welding supply house.

I sourced the bulkhead electrical connection from Radium Engineering. There are less expensive fittings on-line.

 

[Demonic]

What pump is that, and is it loud?

 

[jbc426]

What pump is that, and is it loud?

Pictured is a 255 LPH Duestchwerks pump. I can't hear it with the engine off.
I have since upgraded it with a 440 LPH pump that pushes the fuel up to my surge tank where a second 455 LPH pump feeds the fuel injectors. I can hear this pump when it primes for a second when the key is turned on. I don't hear it once the motor is started. I'm running a full TTI 3" cross-over system with Dynomax mufflers.