Disassembling Fuel Rail

[zilog 0]

I am going to remove/replace the injectors and have them cleaned in an ultra sonic cleaner. Is there a good chance that I will experience fuel leaks if I dont replace the fuel rail seals? Second, is removing/refitting the injectors a difficult thing to do?

[mattbenselin 0]

If you mean the rubber O rings then just check that they are all intact and not corroded or split and you can re use them. Any that show signs of old age or damage. replace.

 

Removing the injectors is not to hard. You need to, if you have an inlet mounted coil, remove that first, then undo the 2 bolts in the rail which hold it to the manifold. Then undo the 2 bolts which hold the pressure regulator end of the rail to the manifold and the rail should be loose-ish. Gently pull on the rail evenly across the injecotrs until they pop out of the manifold, It is not necessary to remove the fuel feed and return lines. The injectors are held in the rail by clips which need to be popped off. The injectors will now come out of the rail, but be aware the rail is full of fuel!!! So be sure to have a cloth to soak up the excess. Check the seals and replace any which are bad but they may all be ok. Make a note also which loom connector goes to which injector as often they are not marked.

Re-fitting is reverse of removal.

 

Good luck

[Rom 0]

Its advisable to replace the seals yes. But most places that do the cleaning etc supply new seals. Along with the filters etc.

 

There not difficult to remove, but they can be pretty tight. They just pull out, but they have been in there for years ! Just be carful not to apply force other than upwards, or maybe twist a little. I cant remember what 8v ones are like, but the Mi rail has little clips that you need to slide off .

 

EditDamn i type slow !!!!

Edited October 29, 2008 by Rom

[zilog 0]

I will do the cleaning myself by electrically opening the valves and cleaning them with ultrasound/ethanol, is this a wise thing to do? The car has started runnig very jerkily after having ran 60% E85 for a few tousand kilometers (now jerky on both E85 and pure gasoline), and I suspect the injectors to be full of crap since the the entire fuel- and ignition system including the wiring has been replaced by me before I started using E85. Doing the job myself is also the reason for not having easy access to new seals (the shop nearby needs more than until the weekend to get new ones)

[ALEX 98 1 Cars]

Id send the injectors off as they have a propper rig to measure the effectiveness of the cleaning cycle and provide you with a print out.

It's cheap enough and you usually get them back in a few days by post.

Here's who I used

 

As for the O rings Wickes do their own O ring Kit for only £10 that might have the right size.

usually with the few car parts they sell.

[DrSarty 90 1 Cars]

Also be VERY aware, that not only is the fuel rail full of fuel, but that it's at about 42psi will give you a nasty mouth or eyeful (which stings to high buggery I can tell you) of petrol. It's not nice.

 

Injector plugs are best marked, but as they batch fire it doesn't make a difference which order they go back on, although the loom length/layout will probably only really suit one order.

Edited October 30, 2008 by DrSarty

[KRISKARRERA 2 1 Cars]

There's a chap in my town who does injector cleaning, round about £40 I think. Cleans them, changed the filter baskets and all that.

[zilog 0]

The thing is that I cant get to work without the car, so I cant disassemble it for that long time, will give it a try tomorrow evening.