So i redid the dual pumps in my SS. I tried to keep this as clean and OEM as possible.

I installed two Walbro 340's tied into an 8an braided stainless hose. I've added instructions below:

So we start with a stock 99+ fuel bucket assembly. It needs to be stripped of the Evap sensor (save for later) the pump, and the regulator.



We need to relocate the evap sensor to make room for the bulkhead fitting and the larger wiring. So we tap the hole to 3/8 NPT to add a push to connect fitting.



Once the hole is tapped, a 3/8 NPT x 3/8 OD Tube elbow fitting is installed.



The top of the sender assembly needs to be sanded smooth.



The old return port is plugged. I used a vacuum cap with some heat shrink tubing to retain it. Also, the old feed port will be used as a return. I installed a -6 AN adapter fitting.





Next, The -8 bulkhead fitting as well as the 4 wire bulkhead fitting. rather than drill a hole through the top and seal it with goop, i found that racetronix carries a bulkhead fitting. This is nice because it allows 14 gauge (I believe) wire to be run to the pumps.







Some cuts need to be made to the bucket assembly to allow both pumps to fit. Rather than using a tee, i found a pneumatic flat hex manifold. The hoses are put onto the assembly, and the pumps are clamped together.







The stock fuel pump leads are removed. The two halves of the bucket are put together and the pumps are wired.







And now we're ready to install the pump assembly.



Here is the installed pump assembly. Note the relocated EVAP sensor

 

that's very nice, and i like the evap relocataion. so how does the bucket stay full with fuel?

 

Thanks for the kind words. I'm not sure what you mean by your question. The bucket stays full like any other setup. The holes on the bottom allow the fuel to flow into the bucket. There are no holes on the sides so that fuel doesn't slosh away from the pumps during cornering.

 

Very nice write up. I'm always interested to see peoples new innovative ways to stick two pumps in the factory bucket. I like the evap sensor relocation as well.

All of the fuel being returned through the regulator ends up back in the bucket so that helps keep the pumps submerged. Any fuel being picked up by the pumps comes through the socks at the bottom so there will almost always be plenty of fuel unless you run the tank quite low.

 

bingo. people who drive my car have a bad habit of doing just that, including me (but only once ever)

 

Are you running a hot wire kit for each pump?

 

Yes,

Each pump will be wired with its own relay, fuse, and feed wire.

 

im getting a P442 small leak evap system i just replaced my faulty regulator so i just got a new assembly with pump.. then that code started to show up....

my point... your write up made me think that it aint fit or sealed well .... gnna see.

thanks and that's some great info.

are you using dual racetronix pumps?

 

Im using dual walbro GS340 pumps. Theyre about 7 years old at this point. Maybe older.

 

How much those 340s cost and how much HP they can handdle?
were you find the push conecting elbow for the 3/8 npt fitting?
And were can i buy the y pkug that you use to connect both pumps together?
Nice job man.

 

What's the part number for that Racetronix 4-conductor bulkhead connector you used? That is pretty slick.

 

They're standard walbro 255 pumps. I'm not sure what the going price it, i bought them so long ago.

The elbow fitting is a legris-style 3/8 mpt x 3/8 tube push to connect fitting.

The manifold is a flat hex manifold. 3/8 inlet x 1/4 outlet.



Bulkhead Connector: BCWS-001
Fuel Pump Connector: RCS-001 (2 required)
Fuel Line: FFHR-06 (6 inches to 1 ft)
Clamps: OCLMP15.3 (4 required)
Sleeve: 122-332C (only 1 fits)

Youll also need as mentioned above, a hex manifold and a 3/8 x 3/8 push to connect fitting as well as 6-8 inches of 3/8 OD nylon tubing.

Along with this youll need various fittings such as a -8AN bulkhead fitting and a -8 an female to 3/8 male NPT adaptor fitting.

 

Schematic is below. Dont burn your car to the ground and blame me!

 

We offer genuine Walbro 255LPH pumps here:
http://www.racetronix.biz/itemdesc.a...SS294M&eq=&Tp=
filter socks and accessories are listed to the right of the web ad as add-ons.

 

http://www.racetronix.biz/itemdesc.a...PH-001&eq=&Tp=

This harness now features weatherproof/sealed relays and sockets.

 

I'm doing almost the same thing. It looks like you have the tank out of the car. FYI the bulk head fitting will hit the floor if you don't clearance it. I built the clearance into a trap door.

 

Looks good. I have a question on the bucket modifying. For the portion of the bucket that houses the stock pump like how its made to accept just the stock pump, do you just dremel all of that material outta there to make room for 2 pumps?

 

Awesome write up!

 

I used a dremel with an end-mill type cutter bit to removed material. I should have taken pictures of the cut up bucket. If you go slow, use a file to clean it up it will look as if it came like that.


I also have pictures of my fuel pump access door as well as the relay wiring i did. I will take pictures this weekend of the completed project which will include the fuel rails up front.

 

I went ahead with the cutting the other day. Looks pretty good I cleaned it up real well. I just drop the tank on mine since I have no exhaust right now.