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Holley Sniper EFI for BBD Carbs

ag4ever

Average Nut
Silver Member
Lifetime Member
City
Richmond
State
TX
External pump, need to figure out how to get feed and return lines installed, and it uses a bolt in flange. For the 20 gallon tank, there is much work needed to get it functional.

There are other fuel sending units that use a similar system.

The ones I really want are those used in planes that have no moving parts and use pressure transducers. But I have not found one with the appropriate ohm range. To widen a search, you can look for mopar compatible units as AMC and Dodge/Plymouth/Chrysler both used the same ohm range.

Another option is to find a quality Mopar sending unit and rebuild it for our application.

Just brainstorming out loud.
 

ag4ever

Average Nut
Silver Member
Lifetime Member
City
Richmond
State
TX
Tank measurements for record keeping. 20 gallon factory tank.

Tank depth from bottom of sending unit flange to bottom of tank 11.75”

Sending unit hole diameter 2”

Sending unit threads in tank hole diameter, slightly over 2.8”

Sending unit flange diameter 2.75”

All numbers are rough dimensions.

Also, it looks like there is a set screw in the side of the tanks inc unit. I wonder if the mounting flange can be removed and a new one made to fit the 20 gallon tank. I may have to order one to test it. May.
 

ag4ever

Average Nut
Silver Member
Lifetime Member
City
Richmond
State
TX
Time to clean the varnish & rust from the tank using a mild acid.

6AC5DB24-A4B6-4538-9218-B01040AE95A4.jpeg
 

Chamba

Not obsessed: focused.
Member
SOA Member
City
Vero Beach
State
FL
How similar are the flanges for the sender on the 15 and the 20 gallon tanks? It wouldn't be hard to lengthen the intake on the holley 15 gallon pump.
 
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ag4ever

Average Nut
Silver Member
Lifetime Member
City
Richmond
State
TX
After 1 hour of acid soak, got this out after filtering and putting the acid back in the tank.

6C1DD82F-722F-4D84-BF78-C9FBA562A4F5.jpeg
BC40B0EA-87CA-4292-9618-06D7BA39FF3A.jpeg
 

ag4ever

Average Nut
Silver Member
Lifetime Member
City
Richmond
State
TX
How similar are the flanges for the sender on the 15 and the 20 gallon tanks? It wouldn't be hard to lengthen the intake on the holley 15 gallon pump.

Not sure, none of my Jeeps have the 15 gallon tank, so I don’t have one to compare it to.

Here are a couple of new 20 gallon sending units.

74E892FD-F585-44EC-8660-372099C2C38F.jpeg
 

Belizeit

CJ-8 Member
Gold Member
City
River Ridge
State
La
I don't know what the difference is between 15 & 20, but I was going to reuse my 15 poly and could tell my new Holley in tank pump was not going to seal well so I got the metal Holley tank.
 

jpnmaine

Well-known member
Member
City
East Wilton
State
ME
I may still go with tanks inc unit. Was told that their kit was only for a 10.5" (think) depth and you would have to build extensions to allow for the additional depth...which they have. I have an CJ OEM 20G tank and I plan on cutting a hole and dropping a unit in that way. Simular to tanks inc video. And leaving the factory sending unit alone to just act as tank level. Since the tank depth is roughly about 14" to the left rear of the tanks sending unit hole..I have to build/mod one anyway. So I am now looking at the factory wrangler fuel injected unit to modify just for pumping. I will have to make or purchase a trap tray to keep suction full. Just need to see what real estate there is at that location to see if it is feasable.
 
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spankrjs

Scrambler Junkie
Lifetime Member
SOA Member
City
Biloxi
State
MS
I installed a TanksInc pump in my green Scramblers 15 gallon metal tank. I left the OEM sending unit in place to work the OEM gas gauge. I hooked up an external pump to the OEM sender as emergency back up.


I cut a new hole in the top of the tank for the TanksInc set up. So far, works perfect.

For the plastic 20 gallon tanks I am looking at the Aeromotive Stealth module. More expensive than TanksInc, though.
 
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walkerhoundvm

Just trying to stay upright
Lifetime Member
City
Cave Creek
State
AZ
I installed a TanksInc pump in my green Scramblers 15 gallon metal tank. I left the OEM sending unit in place to work the OEM gas gauge. I hooked up an external pump to the OEM sender as emergency back up.


I cut a mew hole in the top of the tank for the TanksInc set up. So far, works perfect.

For the plastic 20 gallon tanks I am looking at the Aeromotive Stealth module. More expensive than TanksInc, though.
I'm using the aeromotive stealth. So far so good, but it still has a bit of a whistle.
 

jpnmaine

Well-known member
Member
City
East Wilton
State
ME
They make a very nice product. Both offer a solution for conversion of pre fuel injected gas tank
 

ag4ever

Average Nut
Silver Member
Lifetime Member
City
Richmond
State
TX
Are they held in with a crown ring which screws in from the top?
The 20 gallon OEM tanks use a plastic “screw” to hold in the sending unit.

A069AC6B-0ECC-48D8-9227-81BD2E515D23.jpeg
E3850D7B-5D4D-4EC0-8179-AAACCCF86D91.jpeg
I believe the oem 15 gallon tanks use the metal ring with tabs that is wedged between tabs on the tank and the tank. The 15 gallon uses a very common mounting system that a lot of aftermarket tanks use. The other common clamp is the 6 bolt pattern.

crown-5357373K-rear-mounted-fuel-sending-unit-15-gallon-tank-jeep-cj-tabletop.jpg
 

ag4ever

Average Nut
Silver Member
Lifetime Member
City
Richmond
State
TX
For the plastic 20 gallon tanks I am looking at the Aeromotive Stealth module. More expensive than TanksInc, though.

Does the Stealth module require cutting a new hole? Do you have a model number?

I am working on the Overlander, so I am trying to make everything as reversible as possible, don’t really want to cut into an OEM tank.
 

spankrjs

Scrambler Junkie
Lifetime Member
SOA Member
City
Biloxi
State
MS
Does the Stealth module require cutting a new hole? Do you have a model number?

I am working on the Overlander, so I am trying to make everything as reversible as possible, don’t really want to cut into an OEM tank.
Yes, you would have to cut a hole in the tank, pretty sure it won't fit in the OEM hole.
 

walkerhoundvm

Just trying to stay upright
Lifetime Member
City
Cave Creek
State
AZ
Are we talking about the aeromotive stealth 340 in-tank pump?

It fits through the sender hole of an OEM 20g tank.
 

ag4ever

Average Nut
Silver Member
Lifetime Member
City
Richmond
State
TX
Are we talking about the aeromotive stealth 340 in-tank pump?

It fits through the sender hole of an OEM 20g tank.

If just using a fuel pump, and modifying the stock type sending unit, why not just use a walbro 255?

Quality pump and much cheaper. That is what I replaced the FiTech pump with.

The 255 supports 500 HP, doubt my 258 will ever see anywhere near that, unless it is parked next to a Vette.
 

walkerhoundvm

Just trying to stay upright
Lifetime Member
City
Cave Creek
State
AZ
If just using a fuel pump, and modifying the stock type sending unit, why not just use a walbro 255?

Quality pump and much cheaper. That is what I replaced the FiTech pump with.

The 255 supports 500 HP, doubt my 258 will ever see anywhere near that, unless it is parked next to a Vette.
I wound up with the aeromotive out of frustration, related to the sending unit problems I mentioned earlier.

Novak sells a sender/pump combo with a modded Omix/MTS sender and a walbro pump. The first one they sent had a bad sender. Pump seemed OK, so they just sent me a new sender. Swapped the pump over and ran it for two months before the pump started causing feedback to my fuel gauge - eventually fried it. There's an issue with the way Novak has the pump power isolated from the sender/gauge circuit.

At that point, I lost faith in the kit. Asked for a full refund. Sent the original, broken sender and the pump back. Kept the second, working sender and bought the aeromotive. Spent an hour or so working through the connections to make sure everything was well isolated and functional.

Nothing against the walbro, I'm sure it's fine, I just grew tired of dealing with everything Novak was sending me.
 
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