11 replies to this topic

[JohnnyTSi]

Facing a trip to Mexico and caught with a mostly full tank with low ethanol percentage, I wanted a way to pump out most of the fuel in preperation for a fill up of e85. I almost bought an AMS fuel drain line, but was having a hard time with the $160 price tag for such a simple part. Here is what I came up with as an alternative, total cost was about $27 for one, beating my expectations by a huge margin, all parts were sourced from Amazon

 

 6.99 3/8" Female Bundy

 5.50 3/8" Male Bundy

 2.65 3/8" Brass "T"

 2.50 3/8" Brass Ball Valve

 6.50 3/8" EFI Fuel Hose

 2.50 3/8" EFI Hose Clamps

 

26.64

 

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[Tim]

Nice dyi!! Thanks for the share

[socalaviator]

Sweet. I have always wanted one without paying the GTR tax. Thanks for sharing!

[JohnnyTSi]

CAUTION - The fuel tank can be under pressure when the car is warm, make sure to open the fuel tank cap and equalize pressure before disconnecting the fuel lines.

[elf_cruiser]

Dumb question but I’ll need to do this for the first time ever. Will the pumps run indefinitely with the ignition on but engine not running?
I only need to do this once for a car show that requires less than 1/4 tank of gas...

Thanks!

[JohnnyTSi]

Dumb question but I’ll need to do this for the first time ever. Will the pumps run indefinitely with the ignition on but engine not running?
I only need to do this once for a car show that requires less than 1/4 tank of gas...

Thanks!

 

1. Open the gas cap to release any pressure in the tank, if the fuel is warm from driving, the tank builds up pressure when you stop and will spray gas all over when you disconnect the fuel line.

2. install the tool into the fuel feed line on the car (the big one)

3. close the valve completely

3. start the car

4. slowly open the valve until a steady stream flows out the discharge hose. Be careful not to open it to far or the car will starve for fuel and stall

5. monitor the fuel can so you don't over fill the can and spill fuel on the ground

6. when the car's tank is nearly empty you will hear a gurgling, sucking sound coming out of the fuel line, this is the primary pump picking up air

7. turn the car off, your tank is very close to completely empty.

 

OF NOTE is that the pumps are cooled by fuel flowing around/through them, you could run the car until it stalls, but that may cause the pumps to get hot. I've seen it done like this several times without issues. I don't let my car run completely out to the stall point though.

[elf_cruiser]

1. Open the gas cap to release any pressure in the tank, if the fuel is warm from driving, the tank builds up pressure when you stop and will spray gas all over when you disconnect the fuel line.
2. install the tool into the fuel feed line on the car (the big one)
3. close the valve completely
3. start the car
4. slowly open the valve until a steady stream flows out the discharge hose. Be careful not to open it to far or the car will starve for fuel and stall
5. monitor the fuel can so you don't over fill the can and spill fuel on the ground
6. when the car's tank is nearly empty you will hear a gurgling, sucking sound coming out of the fuel line, this is the primary pump picking up air
7. turn the car off, your tank is very close to completely empty.

OF NOTE is that the pumps are cooled by fuel flowing around/through them, you could run the car until it stalls, but that may cause the pumps to get hot. I've seen it done like this several times without issues. I don't let my car run completely out to the stall point though.

Ahhh, this setup allows the engine to run while siphoning off just enough gas. Got it - thanks!

[Dsm_alpha]

Another simpler option is to disconnect the sending sensor harness under the back seats

[JohnnyTSi]

Another simpler option is to disconnect the sending sensor harness under the back seats

 

Huh! Maybe I'm doing it wrong? How does this help empty the fuel tank (including the saddle tank?)

 

John-

[elf_cruiser]

1. Open the gas cap to release any pressure in the tank, if the fuel is warm from driving, the tank builds up pressure when you stop and will spray gas all over when you disconnect the fuel line.
2. install the tool into the fuel feed line on the car (the big one)
3. close the valve completely
3. start the car
4. slowly open the valve until a steady stream flows out the discharge hose. Be careful not to open it to far or the car will starve for fuel and stall
5. monitor the fuel can so you don't over fill the can and spill fuel on the ground
6. when the car's tank is nearly empty you will hear a gurgling, sucking sound coming out of the fuel line, this is the primary pump picking up air
7. turn the car off, your tank is very close to completely empty.

OF NOTE is that the pumps are cooled by fuel flowing around/through them, you could run the car until it stalls, but that may cause the pumps to get hot. I've seen it done like this several times without issues. I don't let my car run completely out to the stall point though.

So I tried this yesterday except I used the return side. No parts or tools necessary, just unhook it and put a funnel with a hose attached to catch the running gas. It was painfully slow. After 45 mins I had only gotten about 4 gallons out. We wound up driving around some highways at high boost and that burned it off much quicker. If I had used the pressure side would it have come out faster?

Cheers!

[haul s]

So I tried this yesterday except I used the return side. No parts or tools necessary, just unhook it and put a funnel with a hose attached to catch the running gas. It was painfully slow. After 45 mins I had only gotten about 4 gallons out. We wound up driving around some highways at high boost and that burned it off much quicker. If I had used the pressure side would it have come out faster?

Cheers!

Even if you ran the car “dry” from the return line, you would still end up with a half-full gas tank, since without return fuel flow the siphon system would not transfer fuel from driver’s half of the gas tank.

[elf_cruiser]

Even if you ran the car “dry” from the return line, you would still end up with a half-full gas tank, since without return fuel flow the siphon system would not transfer fuel from driver’s half of the gas tank.

Copy that, but if starting with a half tank then you’d end up with a quarter tank, yeah?? No wonder it was so slow...