Can a C4 gas tank be siphoned?
04-20-2018, 08:28 PM
#1
Instructor
Thread Starter
Can a C4 gas tank be siphoned?
So I filled my tank up before storage last December and at the rate of my outings it'll take me far longer than I want to use it up. Can a C4 tank be siphoned with a simple hose and squeeze ball or do the tanks have the anti-siphon *****?
04-20-2018, 09:03 PM
#2
Race Director
Worst case scenario, the fuel pump assembly comes right out the top and you'd have great access to the fuel tank contents. Depending on age and mileage you could put in a New pump while you'e at it as maintenance.
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SR71! (04-20-2018)
04-20-2018, 09:16 PM
#3
Team Owner
It can be siphoned. Just dump some Stabil in it and it probably will be ok.
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SR71! (04-20-2018)
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SR71! (04-20-2018)
04-21-2018, 11:36 AM
#6
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When hurricane season comes I always keep the tank full, to run the generator, stick hose in the neck and suck, easy has pie.!
04-21-2018, 07:10 PM
#8
Team Owner
04-21-2018, 07:31 PM
#9
Instructor
Thread Starter
It was my first season of storage. I just got the car last August. Next year I'll do just that.
04-21-2018, 07:35 PM
#10
Just for reference, another way to to drain the tank is to remove the fuel line from the fuel rail by the intake manifold. The car sits so the tank will drain out itself. Simple.
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SR71! (04-21-2018)
04-21-2018, 07:42 PM
#11
Team Owner
It runs upwards to the top of the tank and through the lines to the filter to the intake manifold?
04-21-2018, 08:03 PM
#12
Melting Slicks
I think he's saying the tank sits higher than the fuel rail so, once the line is open and the cap is removed from the tank the fuel will try to equalize levels at both ends.
But IMO draining the tank at the fuel rail would be a pain. You have to set up a container on the ground and use some sort of funnel and hose to carry it to a container. You would also need to clamp the fuel line while changing containers.
A simple siphon in the filler neck is much simpler.
But IMO draining the tank at the fuel rail would be a pain. You have to set up a container on the ground and use some sort of funnel and hose to carry it to a container. You would also need to clamp the fuel line while changing containers.
A simple siphon in the filler neck is much simpler.
04-21-2018, 08:10 PM
#13
Others knew years ago, but I only learned in '08 playing around with a SR intake and injectors and it would not stop leaking.
People used to use golf Tees to plug the lines because of it.
04-21-2018, 08:12 PM
#14
I think he's saying the tank sits higher than the fuel rail so, once the line is open and the cap is removed from the tank the fuel will try to equalize levels at both ends.
But IMO draining the tank at the fuel rail would be a pain. You have to set up a container on the ground and use some sort of funnel and hose to carry it to a container. You would also need to clamp the fuel line while changing containers.
A simple siphon in the filler neck is much simpler.
But IMO draining the tank at the fuel rail would be a pain. You have to set up a container on the ground and use some sort of funnel and hose to carry it to a container. You would also need to clamp the fuel line while changing containers.
A simple siphon in the filler neck is much simpler.
Correct, and no need to remove cap, it just flows.I agree collection is a PITA but for some scenarios it is quick and painless.
04-22-2018, 12:34 AM
#15
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No! C4 gas tanks are all equipped with the anti-siphone -anti-thieft device....
04-22-2018, 09:23 AM
#16
Drifting
My '90 has a small, round one way flapper in the neck of the tank. Push clear plastic tubing in and siphon. Before pulling out the tube hold back the flapper with a screwdriver, otherwise it will skin the plastic as it is removed and shards will fall back into the tank.
04-23-2018, 07:59 AM
#17
Drifting
[QUOTE 
That "flapper" is not an "anti-siphon device". I've drained my C4's tank numerous times with a siphon hose. Matter of fact, its the easiest car I own to get fuel out of if I need some for the mower./QUOTE]
Push the flapper aside with a screwdriver and with a small flashlight you can see down to the bottom of the tank. Good for seeing if any water or rust is at the bottom.
That "flapper" is not an "anti-siphon device". I've drained my C4's tank numerous times with a siphon hose. Matter of fact, its the easiest car I own to get fuel out of if I need some for the mower./QUOTE]Push the flapper aside with a screwdriver and with a small flashlight you can see down to the bottom of the tank. Good for seeing if any water or rust is at the bottom.
04-23-2018, 12:44 PM
#18
Team Owner
[QUOTE That "flapper" is not an "anti-siphon device". I've drained my C4's tank numerous times with a siphon hose. Matter of fact, its the easiest car I own to get fuel out of if I need some for the mower./QUOTE]
Push the flapper aside with a screwdriver and with a small flashlight you can see down to the bottom of the tank. Good for seeing if any water or rust is at the bottom.
That "flapper" is not an "anti-siphon device". I've drained my C4's tank numerous times with a siphon hose. Matter of fact, its the easiest car I own to get fuel out of if I need some for the mower./QUOTE]Push the flapper aside with a screwdriver and with a small flashlight you can see down to the bottom of the tank. Good for seeing if any water or rust is at the bottom.
04-23-2018, 02:19 PM
#19
Burning Brakes
I have a external electric fuel pump I had for priming my old GMC Astro with 318 detroit diesel when it ran out of fuel and had to be primed. Pump had hose that would go in a car tank and electric cable's to reach battery.
On my c4 I just fill it up and use stabilt. Than after a
couple of tanks put some amsoil pi fuel additive in.
On my c4 I just fill it up and use stabilt. Than after a
couple of tanks put some amsoil pi fuel additive in.
