efi fuel tank

[flyinlow]

When you retrofit EFI on older Mopars you have to add a high pressure electric fuel pump near the gas tank. 

Are they dependable ? 50,000 miles + ?

How noisy are they ?

If your tank is  below 1/4 tank and you accelerate or corner hard does the pump draw air ?

[tan top]

you will need a swirl pot  in the tank or a baffled sump ! soon as pump looses pressure it will feel like you have just shut the motor of for a second or two ! 

[ChgrSteve67]

You can install a sump tank in the engine compartment and run your high preasure pump from it to your efi system along with your return fuel line. Use your mechanical pump to suck gas from your rear tank.

Just another option for you.

[flyinlow]

 What is a swirl pot? How would you install it in the stock tank? The pickup installs from the side on a 73 tank.



How big is a sump tank?  My hi volume carter street pump would keep the sump tank filled ,but how much fuel does the high pressure electric pump return to the tank?



My tank is 38 years old so I would not mind replacing it.


Thanks for the information, Craig

[ChgrSteve67]

Have one made to fit your needs and placement in the engine compartment.
I like next to the rad on the passenger side in front of the mech pump.
Your going to want it to hold between 1/2 gallon and 1 gallon.

There are some on the net but they are primarily for racing.

The amount of gas returned to tank will depend on your pumps flow rate and the amount of gas that is not consumed by the efi system.

Note: Most people still run a return line from the sump tank back to the gas tank in order to vent the sump tank properly.

[Rolling_Thunder]

I retrofitted a stock newer model pump into my tank - uses its own cup / chamber so the pump never starves for fuel - also it was short enough so I did not have to modify the stock look of the tank with a sump - nor the floor...     

[flyinlow]

I retrofitted a stock newer model pump into my tank - uses its own cup / chamber so the pump never starves for fuel - also it was short enough so I did not have to modify the stock look of the tank with a sump - nor the floor...    

On a 2nd gen car I could see that, the sender opening is on the top. Not sure how I could do it on a 3rd gen.

If you keep the tank above 1/4 full  would you have uncovering problems with a stock pickup and external pump?

Could you add a small accumulator tank and a check valve to keep the engine running for brief fuel delivery lapses?

[elacruze]

I retrofitted a stock newer model pump into my tank - uses its own cup / chamber so the pump never starves for fuel - also it was short enough so I did not have to modify the stock look of the tank with a sump - nor the floor...     

Do you have any part numbers or photos? What fuel pressures are you running?

[ChgrSteve67]

If you keep the tank above 1/4 full you will not need a sump tank. The stock pickup should work fine.

[darrenb811]

Hi, I've modified my (new) original tank as I wanted to keep the tank in place [not a big fan of fuel cells in street car].

We made 2 access plates for the top of the tank which can be accessed via a removable plate in the trunk floor. they are billet plates & the front plate suspends two Aeromotive A1000 pumps, rated for continuous duty [which was the knockout criteria for my pump selection] provided they are submersed and have a good feed.
In the centre portion of the tank we constructed a well/sump which has 4 x one-way check valves so it is always kept full as possible (cornering, braking, etc etc). We are running 2 hard-line pickups from this sump into 2 filters feeding into the two pumps.
The pumps are staged in operation, and the 1st (or primary) pump operates via a speed reduction controller for lower rpm operation. I worked with Aeromotive to design the system as we need as my requirements are a little unique. I am running E85 which requires more fuel delivery (try 16 staged-sequential injectors) and system capability for considerable delivery at [1,500hp ~1,100 ft/lbs @ 15 lbs of boost 500gal/hr/p/pump] peak output combined with low level driveability.

Here's some pics of the tank modifications:

[darrenb811]

more pics:

[darrenb811]

with tank installed:

[tan top]

good mods to the tank     thats  what the EFi set up needs 

[elacruze]

Hi, I've modified my (new) original tank as I wanted to keep the tank in place [not a big fan of fuel cells in street car].

We made 2 access plates for the top of the tank which can be accessed via a removable plate in the trunk floor. they are billet plates & the front plate suspends two Aeromotive A1000 pumps, rated for continuous duty [which was the knockout criteria for my pump selection] provided they are submersed and have a good feed.
In the centre portion of the tank we constructed a well/sump which has 4 x one-way check valves so it is always kept full as possible (cornering, braking, etc etc). We are running 2 hard-line pickups from this sump into 2 filters feeding into the two pumps.
The pumps are staged in operation, and the 1st (or primary) pump operates via a speed reduction controller for lower rpm operation. I worked with Aeromotive to design the system as we need as my requirements are a little unique. I am running E85 which requires more fuel delivery (try 16 staged-sequential injectors) and system capability for considerable delivery at [1,500hp ~1,100 ft/lbs @ 15 lbs of boost 500gal/hr/p/pump] peak output combined with low level driveability.

Amazing. How much are you selling these for? 

[darrenb811]

.

Amazing. How much are you selling these for? 

Thanks for your comments!.

To be honest I haven't thought of selling any (maybe I should). This has been a one-off for my car & as I found out early on, & like most things on this build... expensive(!). 
I had engineer make the changes to the fabrication of the tank, baffles etc, and his CNC makes the billet plates, he designed pump setup etc it up on SolidWorks CAD software. Aeromotive came up with the system requirements & we had a few iterations to get it where we think it will be right. Tank modifications are ~$2,000. Parts extra.
With E85 everything has to be anodized, all the tank baffles must be dry soldered as welding will cause the steel to rust (rust in fuel = not good). We designed it for maintenance without having to remove the tank, and I didn't want to run any fuel lines through the trunk, so the -10 lines exit near the usual spot. A -8 return line keeps the cold fuel circulating. Everything here in Australia has to be designed for safety to pass strict regulations for road-worthiness & to obtain registration. Pump electronics will run through the computer system I am putting in, which will control pump staging, speed (primary pump), & safety (sudden pressure loss = kill), etc.
Everything in the combination I have designed for continuous duty, serviceability, safety, and ultra-high end performance.


If anyone is seriously interested I'll do some work on costings for a similar setup.

[defiance]

I'm in the middle of the same on mine.  I've used one of the inline walbro pumps, but the thing about it is on my car (and probably most of you guys as well), there's just nowhere to put the pump 'below' the fuel tank, so it's LOUD.  

So I gave up and decided to figure out a way to do in-tank.

I didn't go quite as far as what the above poster did (amazing work, btw, just amazing), but a MUCH more scaled down version of an in-tank pump with some minimal baffling is available -

http://www.tanksinc.com/index.cfm/page/ptype=product/product_id=84/category_id=61/home_id=61/mode=prod/prd84.htm

I plan to use a spacer to lower the tank by about 3/4" to give room for lines across the top, and I'm already in the process of re-running fuel lines, so when I do I'll just run them to a junction at the front of the tank (allowing for easier disassembly).

I wish I had the skill to do what darren did, but I think this will probably work fine for my app

[defiance]

darnit - quoted instead of editing