How can I release Fuel Pressure

[pSimytSi]

Ok I'm about ready to take my head off to get rebuilt because the T-Belt snapped.. Everything but the fuel lines to and from the rail are disconnected and seeing the T-belt is broke, I can't start the car so how else can I relieve the fuel pressure?

 

[donniekak]

Disconnect the fpr or feed line. It's not going to squirt everywhere. More like about 3-4 ounces of fuel running out. That is how i do it.

 

[pSimytSi]

That's what I was about to do but that line was rock solid with pressure. Thinking about 45psi shooting out of that little thing scared me into doing a search which had no results for anything related. So just wrap a rag around it and slowly loosen the clamp?

Would disconnecting the fuel pump and turning the key on and off without cranking it do anything?

 

[bagged420a]

The manual suggest to disconnect the fuel pump then turn the key to the on position to releave fuel pressure.

 

[Calan]

Disconnect the fpr or feed line. It's not going to squirt everywhere. More like about 3-4 ounces of fuel running out. That is how i do it.

Or just take an extra 2 minutes and do it the correct, safe way...unless the risk of fuel being sprayed into your eyes and all over the engine bay doesn't bother you.

 

[lacroixdp]

+1 There's a damned good reason why you shouldn't do it that way - it's called high pressure injection and it can kill you, especially if you're working on diesel fuel rails.

Jet injector - Wikipedia, the free encyclopedia

 

[snowborder714]

The manual suggest to disconnect the fuel pump then turn the key to the on position to releave fuel pressure.

This is how I do it.

Remove back seat, unscrew fuel pump cover, unplug fuel pump, start car and let run until it dies, and then try to start again. If/when you take the fuel lines off the rail, make sure to have a rag underneath as some fuel will still be in there. And once they're off, tilt them straight down to the ground with a rag/bucket underneath to get all the fuel out.

 

[donniekak]

The manual suggest to disconnect the fuel pump then turn the key to the on position to releave fuel pressure.

Disconnecting the pump and turning the car over will release the pressure. Turning the key to the on position does nothing. The gas doesn't spray everywhere. Liquids don't behave like gasses when pressurized. They don't compress. When you unhook either end of the fuel rail it just pours out. I have done it on pressurized and un pressurized fuel rails at least hundreds of times. The same amount of fuel pours out either way. Diesels use direct injection, thus the very high pressures. If your car has sat for long enough to cool down i bet the fuel pressure is less than 20 psi.

 

[fergulus]

You guys are forgetting that he has no timing belt to turn the entire engine, thus would be messing up internals if he tries. As the last guy said, your fuel pressure drops the longer you have it sitting. Even at 42psi you wont have a giant spray of gas, and there isnt that much to leak out anyways. Just remember "safety first."

 

[AjWit]

When i did a HG job a few weeks ago on another car i just pulled the EFI fuse, turned the key and bye bye to all fuel. its a good idea, but no TB might put a damper on my plan.

 

[Urban Survival]

I just let the car sit and then pull off the lines. I have never had it spray on me doing it that way.

 

[vtec_ths]

I just did my whole fuel system tank to the return. after sittin a few hours the fpg read 0 psi. I removed the line off the rail and some fuel but no pressure. just be sure to where safety glasses and use a rag.

 

[Bud92gsx]

I just did my whole fuel system tank to the return. after sittin a few hours the fpg read 0 psi. I removed the line off the rail and some fuel but no pressure. just be sure to where safety glasses and use a rag.

+1
Safety first!!!

This is how I do it.

Remove back seat, unscrew fuel pump cover, unplug fuel pump, start car and let run until it dies, and then try to start again. If/when you take the fuel lines off the rail, make sure to have a rag underneath as some fuel will still be in there. And once they're off, tilt them straight down to the ground with a rag/bucket underneath to get all the fuel out.

+1

Ya I have always just used a rag and unbolted the two 10mm bolts to the inlet on fuel line..You will have some gas spill, just take some water and wash it off so you don't have a fire down the road, just in case..But the rag will catch most of the gas. The turn the lines upside down to drain fully and there you go..

 

[daren_p]

The pressure will eventually bleed down. Just crack a fitting with a rag covering it, just incase there still is some pressure & it descides to spray. This is the method I've always used & never had any issues. Safty glasses are never a bad thing either.

 

[donniekak]

When i did a HG job a few weeks ago on another car i just pulled the EFI fuse, turned the key and bye bye to all fuel. its a good idea, but no TB might put a damper on my plan.

You do know that with no power to the mpi circuit the injectors don't open. The lack of pressure was due to it bleeding off.

 

[solidviper89]

Just unbolt the lines and have a towel around when you have to separate the line from the fuel rail.

 

[siceclipse]

Fu(k this being safe shit

just unbolt the fuel rail wrap a rag around the first injector and wiggle it off.

 

[jaredS83]

Wouldn't an easier way to disconnect fuel pump without pulling seat and wires be just pulling fuse for fuel pump?

 

[92gsxtsi]

I put injectors in my car 2 hrs ago and all I did was unscrewed the gas cap and put a rag over the fuel rail and slowly tilted it off with feed and return lines still hooked up. Then wiped up the spilled gas off the intake manifold. Might have spilled 2 shot glasses full if that

 

[SmalltownDSMer]

2 shot glasses is actually quite a bit of fuel, OP- Do you have a FPR? A few hours after driving the car, my FPR usually reads zero. If you haven't started it in a while it should have loss quite a bit of pressure and you should be good with covering the fitting with a rag while you break it loose. Just be sure to wear eye protection, whatever clown said screw safety is a complete moron.


Shit, just realized this was revived from '09

Jayson

 

[blackrosenova40]

You could also disconnect your fuel pump, turn your key on and rotate your cam angle sensor.