I've acquired a couple of key parts I need to put EFI on my 1975 F-250 crew cab. Here's my current setup and plans for the EFI setup. I still plan to run dual tanks so I have 50 gallons of total fuel capacity.

Current setup:
Holley 4160 - List number 1850-3, 600 CFM carburetor
18 gallon in cab gas tank (1973/77 18 gallon in-cab tank with Evap/Em: D3TZ-9002-G)
18 gallon super camper special aft axle gas tank
Mechanical fuel pump
In dash D5TZ-9A050-A 5 terminal fuel selector switch
FV1 - 3 port fuel valve
No return lines

EFI Setup plans:
Holley Sniper EFI 550-510
18 gallon in cab gas tank
32 gallon Aerotank aft axle gas tank with Standard Motor Products FV5, 6 port fuel valve, along with a 42-203 pigtail
Same in dash D5TZ-9A050-A 5 terminal fuel selector switch
Return lines to each gas tank. (I've built a return line that will go from the FV5 to the in cab tank on the passenger side to the Evap/Em port near the center of the tank. I need to build the return line to the aft axle tank still.)
I have yet to acquire a mechanical fuel pump block off plate and come up with an exact plan for the inline fuel pump.

Questions:
Should I plan on using a 1" phenolic spacer? I tend to think I should. Any recommendations on open vs divided plenum? I lean towards open. I am running an Edelbrock Performer RPM intake manifold on top of my 390 -> 431ci stroker.
For the in-cab gas tank fuel pump, I'm thinking that an inline pump shortly after the exit from the in-cab tank, before the Standard Motor Products FV5 will be ideal. Suggestions?
How would wiring for the FV5 work with the stock D5TZ-9A050-A 5 terminal fuel selector switch?
What am I missing or not thinking about?
Have there been developments where a vendor is offering a sending unit for the in cab gas tank that has a return line plumbed in that goes to the bottom of the tank?

@FuzzFace2 would appreciate your input

 

I read a few weeks back where some aftermarket gas tank supplier had developed tanks for our trucks to accommodate EFI whether there was an in cab option I don't specifically remember that detail. I will have to dig it out of my research bookmarks. I'll give a look for you tomorrow
See this post, Ranger 140892 aka Mike would be the guy to talk to on that.
I would. I like the thermal break.
That's all I got maddog Good luck

 

Since you're using a dual plane intake manifold, then definitely use an open spacer. 2" or taller. I installed a Sniper on a Performer and milled the divider down about 1.25", and used a 1" open spacer. It worked fine.

The dual tank thing is tricky. Not sure how you'll beat that one. But I know that if you have one fuel pump, it'll have to be forward of the front fuel tank. That's a looooong way for an electric pump to pull fuel from the rear tank. That will shorten the pumps life significantly. Another possibility is to use your mechanical fuel pump, and get one of those underhood fuel resevoir/injection pumps. And there's not return line necessary for that. And it totally relieves you from having to alter your fuel tank selector system.
Look at this...https://www.summitracing.com/parts/e...oaAg1LEALw_wcB

 

Thanks redroad. At least all the necessary parts for the aerotank EFI portion of this puzzle are either already on hand or in transit.

The post you referred to from @ranger140892 is one that I've read a few times recently and certainly helped lean me towards the open plenum.

Another option I have kicked around is setting up the in-cab tank to feed through the aft axle tank like @rougeriver mentions in this post. https://www.ford-trucks.com/forums/1...l#post19170437

or

not using the 6 port FV5, but getting a second FV1 and wiring it up as @i-w has suggested here: https://www.ford-trucks.com/forums/1...l#post18668291. Has anyone does this successfully? I don't think @alaskaforby4 ever posted up about giving this option a shot.

 

It says they are out of stock, but maybe look into this or copy what they've put together.


https://www.efisystempro.com/dual-ta...scription=true

 

Awesome link, thank you @Doosenberry!! The dual pump kit diagrams provide me confidence that the original route I've been pursuing seems logical. These drawings are almost spot on for what I had in my head, though I was missing a post FV5 fuel filter in my thought process.

 

You're welcome. I'm interested to see how you work out your dual tank system.

I'm currently running the same Sniper you're looking at on my 78 Bronco right now. It's on an Edelbrock Performer intake with a 1" open phenolic spacer and it seems to run fine. I had a second, 1" 4-hole spacer on it as well, but didn't notice any benefit, so I removed it. I had both of them on a previous engine that was carbed and each spacer had a slight benefit, but apparently fuel injection plays differently with spacers.

I have a second Sniper (stealth this time) on the way for another engine and I'm curious to see how it plays with the intake I have. It's going on a Performer RPM rather than just a Performer. Same engine series (460), but much larger displacement (521).

 

A 90-degree bulkhead fitting, like from this kit: https://www.efisystempro.com/fuel-sy...eturn-port-kit might be usable with the factory in-cab sending unit or elsewhere on the in-cab tank. The "PTFE convoluted tube" is only 11" long so I'd need to get a longer tube for the in-cab tank. I'd likely go with submersible fuel hose.

I haven't been able to figure out exactly what Earls adapters are in this above fuel tank return port kit for me to replicate myself.

 

This takes care of everything. All you have to do is mount the sump in the engine compartment, and run the fuel line from your existing pump to the sump.

 

Something like this?


Attachment 279623

 

I see Fitech makes a sump system too.

https://www.summitracing.com/parts/f...saAoW0EALw_wcB

 

Yep!! Like that.

 

First off I got your PM late last night
Second I dont know why you picked me (I am flattered) as I dont know much on the FI side to help you.

It looks like you got a lot of help for all the posts, I did not go into the links so I still dont know much LOL
I was going to say when I first saw your post last night is how to do the return to the in cab tank and get a pump to work with that tank & EFI like the rear tank?
Think you may have that figured out?

Talking about the return you have a 3 port supply (can it handle the EFI fuel PSI?) why not run the same type switch on the return side?
You would have the outlet as the inlet from the motor side and each of the inlets going to the proper tank.
You would only need to run 1 wire from the first switch to the second one to have it work.
I have not messed with the 6 port switch but dont they have more than 1 wire going to it as it also does the fuel gauges?

Now it sounds like you have some if not all the EFI system but I think I have seen posted a re-turn-less EFI system?
Then you would not need to mess with the in cab tank for a return only a pump.
Pump would be easier than pump & return.

Sorry I cant be of more help but looks like you have plenty.
Good luck on the project and keep us posted on this.
Dave ----

 

Are you running a return or vent line back to your tank? If yes what kind of setup do you have there?

 

Found my bookmark No behind the seat and these are available September 2021. Also for the record there was a behind the seat highboy tank equipped for an evap system in calf. trucks probably 76 and 77 1/2years.
Did find this one but pricey.