Has anyone installed micro fuel pump?

[blown motor]

I'm thinking of putting a micro electric fuel pump on the Challenger to aid in starting. Has anyone done this? I'd love some pics of how and where you put it.

[Solarguy]

I have one sitting on my bench right now that I'm going to install just to prime carb after sitting,   Facet 40105,puts out about 3.5psi and supposedly, a mechanical pump will pull through it.  I plan to mount it on the rear shock crossmember, inline, with no regulator or return line.  I'll be mounting a momentary switch somewhere under the dash.  It's my next "to do" on the car when I get time. 

[blown motor]

@Solarguy Im confused about that 1/8 NPT. Isn't that smaller than the fuel line on the car? The line on my car is 5/16 OD so I think that would be 1/4 ID. I see these pumps listed as 1/8 NPT, 1/4, 5/16. I'm confused on which one to buy.

[dodj]

Why not just install a real fuel pump back by the tank and eliminate the mechanical one? Seems overly complicated to run two...no?

Guess you could install this Holley micro pump and toss your engine mounted one?
https://www.holley.com/products/fuel_systems/fuel_pumps_regulators_and_filters/fuel_pumps/carbureted_fuel_pumps/carbureted_electric_fuel_pumps/parts/12-427

[Skdmark]

I have the Holley Muscle fuel pump in my 71 Barracuda with a 318. I installed it when I did the Sniper conversion. It was a pretty easy install along with the Sniper. One nice thing was that it replaced the sending unit, and it does not require a return line. You will need to pull the mechanical fuel pump and install a block off plate along with using EFI rated hose and clamps. Wiring is pretty basic too. Just need a relay

Sidenote, the inside diameter of a 1/8" NPT fitting is approximately 0.269 inches.

[blown motor]

Ok, so I took a short course at the school of Google to try and understand this 1/8 NPT and learned that 1/8 is not 1/8. It makes so much sense now. 

[Brads70]

Maybe try one of these first? Cheap enough? Worked in a buddy's hemi Cuda as it took forever cranking to get fuel to the carb after it sat for a week or 2 ?

https://www.amazon.ca/Aluminum-Return-Diesel-Filter-Petrol/dp/B01M0I9HH3?th=1



Or here is a black one if you wanted something  to blend in more?
https://www.amazon.com/EVIL-ENERGY-Return-Petrol-Aluminium/dp/B08JJ1F79D?th=1

https://www.ievilenergy.com/products/fuel-check-valve?variant=41257014329480

[Solarguy]

@blown motor The ID of the 1/8 NPT x 5/16 Hose fitting I used to transition to 5/16 rubber fuel line is just shy of 1/4 inch, the same as the ID of the nipple on a standard 5/16 fuel filter. 

I mounted and plumbed the pump last night. Using a jumper wire to power the pump, a quick 10 seconds fills the fuel bowls and then tap the gas for a nice healthy pump shot and she fires right up.  Mechanical pump pulls through no problem.  Going for a cruise later to see if I notice any fuel delivery issues in different conditions but not expecting any. 

I still have to pick up a switch and install the wiring.  So far, it's a worthwhile mod.  No more taking off the air cleaner and filling bowl through vent or no more endless cranking.  The fuel bowl and accelerator pump well on my Carter AFB are small and the gas evaporates within a few days.  It is not draining back to the tank so I don't think @Brads70 check valve would solve the issue.   

[dodj]

Maybe try one of these first? Cheap enough? Worked in a buddy's hemi Cuda as it took forever cranking to get fuel to the carb after it sat for a week or 2 ?

https://www.amazon.ca/Aluminum-Return-Diesel-Filter-Petrol/dp/B01M0I9HH3?th=1





Or here is a black one if you wanted something  to blend in more?
https://www.amazon.com/EVIL-ENERGY-Return-Petrol-Aluminium/dp/B08JJ1F79D?th=1

https://www.ievilenergy.com/products/fuel-check-valve?variant=41257014329480

Those look worthwile if the issue is drainback. I'll have to investigate mine. After sitting days it does take some cranking.
I'm thinking a car has one of three possible issues? Evaporation, drainback, or heatsoak boil over.

[blown motor]

@Solarguy Thanks for the update. I think I'm going to go ahead with this. Both the Challenger and the Charger take a lot of cranking after they've sat for several days. I'm always wondering if they're going to start. It makes me wonder though why this wasn't an issue back in the day.

[dodj]

Maybe try one of these first? Cheap enough? Worked in a buddy's hemi Cuda as it took forever cranking to get fuel to the carb after it sat for a week or 2 ?

Where was it mounted Brad? By the tank or the engine?

[Solarguy]

It didn't happen back in the day since the fuel was a much  different composition and these were daily drivers.  My car stays primed for and starts perfectly once the initial no fuel in the bowls is rectified.  It's not boil-over or heat soak as I can drive all day, stop and restart no problem and then start no problem for the next 2 days, any longer than 2-3 days and evaporation happens, easy enough to check as there is no accelerator pump shot.   

That Facet pump is powerful enough that you could mount it pretty much anywhere.  I mounted mine where I did so it's easily reversible.  I didn't  cut any of the existing hard fuel line.

[57Fury440]

I mounted one in the back near the tank on the driver's side. I put a switch under the dash where you can't see it and it works great. I did this about 6 or 7 years ago. Once the carb bowl is full and the car starts, I shut off the electric pump and it runs off the mechanical one.

[dodj]

I mounted one in the back near the tank on the driver's side. I put a switch under the dash where you can't see it and it works great. I did this about 6 or 7 years ago. Once the carb bowl is full and the car starts, I shut off the electric pump and it runs off the mechanical one.

I am surprised the mechanical pump has no issue pulling through the electric pump. Would have thought the switched off pump would introduce quite a restriction. Guessing the electric pump impeller windmills so to speak?

[Brads70]

Maybe try one of these first? Cheap enough? Worked in a buddy's hemi Cuda as it took forever cranking to get fuel to the carb after it sat for a week or 2 ?

Where was it mounted Brad? By the tank or the engine?

Engine I think.... it was 10 years ago now....