auto talk

[bigbore2]

1]  on a fuel injected car, gas flows from pressure regulator to fuel rail?

2]  if I remove the connection/hose between fuel pressure regulator and fuel rail, will gas come out the regulator if I turn key to on and power fuel pump, thereby spraying my engine bay?

I want to drain the gas tank the easy way with a hose connection on the outflow side of the regulator.

[Firehawk068]

On my LT-1 the regulator is on the return side of the fuel system.

Early Jeep 4.0 engines were the same way before they moved the regulator to inside the tank.

Regulator controls the return fuel back to the tank.

[Country Joe]

1]  on a fuel injected car, gas flows from pressure regulator to fuel rail?

2]  if I remove the connection/hose between fuel pressure regulator and fuel rail, will gas come out the regulator if I turn key to on and power fuel pump, thereby spraying my engine bay?

I want to drain the gas tank the easy way with a hose connection on the outflow side of the regulator.

You're on the right track. Just find the return line to the tank from the regulator and disconnect it at a convenient location.

[bigbore2]

great guys, thanx.  I had it backward, on the regulator function.  so the fuel rail gets as high a pressure as the fuel pump can deliver?

I have a drain hose attached to the regulator side of the fuel rail, bypassing the regulator.  I should be good there, ya say?    

[ribbert]

I want to drain the gas tank the easy way with a hose connection on the outflow side of the regulator.

Bigbore, I don't know why you want to drain your tank but one of the main reasons you shouldn't run FI cars out of fuel is because the fuel pumps hate it, especially the high pressure pump. If it doesn't kill it, it will certainly take some life off it and the method you suggest won't remove all the fuel anyway.
These things spin pretty fast and rely on the fuel for cooling and lubrication. Intentionally running it dry, when you have a choice, doesn't seem like the best the best way to go about it.

There should be a drain bung in the bottom of the tank and it will be at the lowest point.

I would suggest that was the easiest and safest method of draining the tank. If you just want to remove the fuel and the vehicle has no baffles in the filler neck you can siphon it out with a hose.

IMO

Noel

[CutterBill]

...one of the main reasons you shouldn't run FI cars out of fuel is because the fuel pumps hate it... These things spin pretty fast and rely on the fuel for cooling and lubrication.

True.

There should be a drain bung in the bottom of the tank and it will be at the lowest point.

Ribbert must be really old.  Here in the USA, they stopped doing that around WW1 or so...

I would suggest that was the easiest and safest method...  you can siphon it out with a hose.

True.

IMO

Noel

[bigbore2]

Fuel pump is brand new.  It has a lot of life in it.  Besides, I am going to sit  and watch the fuel drain into my jug. as soon as it stops flowing , I turn the key off. 

Iv'e had the tank out a couple times.  its not too bad being a plastic tank,  but if I can avoid it................... yes, siphoning.  That never occurred to me. Thanx.             Funny how the brain doesn't work sometimes.

[ribbert]

Iv'e had the tank out a couple times.
 

Just out of curiosity, why have you had the the tank out a few times in what appears to be a fairly modern car (plastic tank and FI)?

Noel