in-tank fuel module for custom tank

DaveyG · Jul 7, 2021

I'm having a problem finding an EFI fuel module (pump and sending unit together) to fit my custom stainless 30 gal. tank. The tank is only 6-1/2" deep and up against the floor pan except for the single top access opening in the tank and floor. Holley makes one (#12-989), but they cannot (or will not) give me minimum depth requirements. Any recommendations are welcome.

The pump requirements are minimum 65 psi, 255 lph. It should also include an anti-pump-starvation tray/sump and filter. The initial build included a frame mount in-line pump and filter, but I'm having problems with vapor lock, (during hot days, slow moving), before the pump, as the fuel line parallels the exhaust pipe, up and over the rear axle. And, I can't stand the squeal of the fuel pump when I come to an idle stop.

diesel_lv · Jul 7, 2021

Are you hardset on keeping fuel line where it is? If not, cut and reroute it to avoid heat. Use Holley fuel mat in the talk as a sump then to a Walbro inline pump. I've used Walbro in my jet boat for yrs and is very quiet n reliable, make sure to have a return line and it will live a very long time. Other option is check into Aeromotive. Not sure on their depth, but hopefully they are willing to divulge that info.

snakeoil24 · Jul 7, 2021

Aeromotive!

Toxic Orange 493 · Jul 7, 2021

Tanks Inc makes fuel pump setups that can go in a tank that is only 6" deep. I just purchased a complete setup from them for my '68 coronet. They send the individual pieces and you have to assembly it. The EFI tank they make for the '68-70 B-bodies is only 6 5/8" deep where the pump sits. The link below will take you to the TanksInc page for the GPA-4 fuel pump that was supplied with the tank I just purchased. It is rated for the 255lph. They also have higher flow versions available if needed. They use Walbro fuel pumps, which was the deciding factor for me to go with the TankInc tank.

https://www.tanksinc.com/index.cfm/...ct_id=227/category_id=61/mode=prod/prd227.htm

Here are a few pictures the fuel pump assembly after I finished putting it together. You have to trim the supply and return lines and then attach the pump and wiring. The supply and return connections are 1/4" NPT.

DaveyG · Jul 8, 2021

I have talked with Tanks and Aeromotive. Neither have a unit including both pump and sender together.

The tight fitting tank is below the spare tire well of my 1956 Ford Ranchwagon. The tank is very close to the floor pan except where the center of the spare tire fits over a rise in the pan. An access hatch to the tank opening is located there. I'm willing to modify the tank, maybe welding a matching rise in the tank opening to accommodate a fuel module/sender, but I need to find one first.

The current in-line pump and pre-filter is from Fitech for their throttle body fuel injection unit. Both are close to the exhaust as well, being mounted to the inside of the frame.

I was hoping someone else has a dual function drop-in tank module. Thanks all!

diesel_lv · Jul 8, 2021

I currently have a Aeromotive tank w pump on my '67 Coronet. But before they made a tank, I had the same problem, the tank was too close to the body to install the intank pump. I routed all my lines at least 6" from the exhaust and mounted my inline fuel pump and filters on the outside of the frame rail in the rear tire well. I used a Walbro as the Fitech would just shut off n when working, was very noisy.if you can't find an intank setup, reroute your lines. And definitely change the pump.

INTMD8 · Jul 8, 2021

Gen 2 CTSV fuel module would work. vaporworx has parts needed to retrofit

DaveyG · Jul 8, 2021

ITMD8: I'll be checking with VaporWorx today. Thank you!

diesel: Good to hear about your similar experience with the Fitech pump. Others have mentioned Walbro too. Rerouting will likely be easier than in-tank. Thanks!

diesel_lv · Jul 8, 2021

Well I just spent 2+ hrs reading VaporWorx site and other articles about them. For the reliability, that seems the way to go. I have a brand new tank that I am going to see if I can have modified for the VaporWorx setup w PWM. Their system is true PWM and will keep my fuel from boiling. I'll also be adding corner pickups at the rear of the tank. Twice now when tank has 9 gallons left in it, it has cavitated while driving up 7% grade due to fuel starvation.

INTMD8 · Jul 8, 2021

^ I think that is a great way to go. Even without the corner pickups the oem bucket setup is much better for fixing fuel starvation than any tank baffles.

DaveyG · Jul 8, 2021

I spoke with Carl at VaporWorx regarding my system. I was impressed. Though it may be more work than installing an alternative, rerouted in-line pump, the technology is current (better) and replacement is easier with OEM components. I'll be contacting Fitech to confirm compatibility.

diesel_lv · Jul 8, 2021

DaveyG said:
I spoke with Carl at VaporWorx regarding my system. I was impressed. Though it may be more work than installing an alternative, rerouted in-line pump, the technology is current (better) and replacement is easier with OEM components. I'll be contacting Fitech to confirm compatibility.

It is absolutely compatible. You will go into the handheld and set PWM to 100% then run the fuel pump trigger wire from the ECM to a higher Amp relay. The VaporWorx PWM unit will then control everything at the psi you need. No return needed, deadhead.

diesel_lv · Jul 8, 2021

DaveyG said:
So far, I haven't found any relay to the existing FiTech fuel pump. Just a 25A fuse.

View attachment 1135486

The relay is built into the ECM. Per Fitech, turn PWM to 100% then run the fused trigger wire to a separate relay as the VaporWorx draws higher amperage. The VaporWorx will then control the PWM the proper way using the fuel pressure sensor.

DaveyG · Jul 9, 2021

diesel_lv said:
The relay is built into the ECM. Per Fitech, turn PWM to 100% then run the fused trigger wire to a separate relay as the VaporWorx draws higher amperage. The VaporWorx will then control the PWM the proper way using the fuel pressure sensor.

I have to agree with you. VaporWorx is the way to go with the latest technology in fuel pumps adopted with OEM equipment. I'm curious, after having installed a Walbro pump and routed lines away from your exhaust on the outside of the frame why you would toss that and go for the VaporWorx solution. Did you still have problems with heat and noise from the in-line system? Performance? My hesitation is due to the modifications it will require: drill & weld new tank opening/pump mount; new fuel gauge; modify floor pan for access to tank opening. (I might avoid this last mod if I can install the pump and fuel line before hanging the tank.)

diesel_lv · Jul 9, 2021

DaveyG said:
I have to agree with you. VaporWorx is the way to go with the latest technology in fuel pumps adopted with OEM equipment. I'm curious, after having installed a Walbro pump and routed lines away from your exhaust on the outside of the frame why you would toss that and go for the VaporWorx solution. Did you still have problems with heat and noise from the in-line system? Performance? My hesitation is due to the modifications it will require: drill & weld new tank opening/pump mount; new fuel gauge; modify floor pan for access to tank opening. (I might avoid this last mod if I can install the pump and fuel line before hanging the tank.)

At the time I had the inline pump, I did not know about remote pickups. I only had the pickup from the 3/8" factory style sending unit. I would end up stalling out due to cavitation/no fuel on any grade. The '67 B body tanks are horrible for fuel injection. I went to the Aeromotive in-tank and still have problems on a long grade w less than 1/2 tank and even w the Fitech PWM controlling the Aeromotive pump, it still overheats my fuel in the tank n it starts to boil n cavitate. I live in a very extreme environment, 125+ ambient temps in the summer. I'm thinking the only thing that is going to work is dish out the money to do the VaporWorx w PWM module setup. Install back corner remote pickups while tank is being modified for the 1-1/2" clearance and the ring opening.

DaveyG · Jul 9, 2021

diesel_lv said:
At the time I had the inline pump, I did not know about remote pickups. I only had the pickup from the 3/8" factory style sending unit. I would end up stalling out due to cavitation/no fuel on any grade. The '67 B body tanks are horrible for fuel injection. I went to the Aeromotive in-tank and still have problems on a long grade w less than 1/2 tank and even w the Fitech PWM controlling the Aeromotive pump, it still overheats my fuel in the tank n it starts to boil n cavitate. I live in a very extreme environment, 125+ ambient temps in the summer. I'm thinking the only thing that is going to work is dish out the money to do the VaporWorx w PWM module setup. Install back corner remote pickups while tank is being modified for the 1-1/2" clearance and the ring opening.

Thanks! you've confirmed my experience during this California hot spell and I'm pulling the trigger on the new VaporWorx installation.

diesel_lv · Jul 9, 2021

DaveyG said:
Thanks! you've confirmed my experience during this California hot spell and I'm pulling the trigger on the new VaporWorx installation.

Just got off the phone w Carl at VaporWorx. I can add 2 accessories from Aeromotive to my current setup, 4 baffles and a jet siphon, then I can use VaporWorx PWM w my Aeromotive pump and get the results I'm looking for. Save me a lot of time n money.

in-tank fuel module for custom tank

DaveyG

Active Member

diesel_lv

Well-Known Member

snakeoil24

FBBO Gold Member

Toxic Orange 493

Well-Known Member

DaveyG

Active Member

diesel_lv

Well-Known Member

INTMD8

Well-Known Member

DaveyG

Active Member

diesel_lv

Well-Known Member

INTMD8

Well-Known Member

DaveyG

Active Member

diesel_lv

Well-Known Member

diesel_lv

Well-Known Member

DaveyG

Active Member

diesel_lv

Well-Known Member

DaveyG

Active Member

diesel_lv

Well-Known Member

Similar threads