Faulty gauge?

Alan

[Edited by AlanG - 5/3/2003 9:03:00 AM]

 

Mark,

Just tried adjusting the screw to fully open and fully closed, while fitted on the car,
it deosn't make any difference to the gauge.

Do you want me to open up the FPR and see if the bit of o-ring is stuck inside?

[Edited by Scoty - 5/3/2003 6:29:49 PM]

 

Lo Alan,

Sorry, I'm getting a bit confused here m8, I've tried to make it a bit clearer in the two pics below.







[Edited by Scoty - 5/4/2003 10:45:02 AM]

 

Sounds like that pipe is blocked.

If the pump is running, it will show a pressure cause it's hitting a dead end.

Can you run the car?
If the car can fire up and idle, you should have a pressure showing.

Also if it runs it means you have fuel pressure.

Alan

[Edited by AlanG - 5/4/2003 12:08:57 PM]

 

Faulty regulator then. Or the return lines blocked.

Blow through it and get high as a kite

Alan

[Edited by AlanG - 5/4/2003 12:21:20 PM]

 

Ok Alan

I went back out to the car just now to replace the pipe from the FPR to return pipe incase the blockage was there.
Open the bonnet, look at the guage on the FPR and it's sitting at 2bar while the FPR is still connected to the return pipe
So I adjusted the FPR screw anti clockwise (out) and lost the pressure. This says to me the FPR is now working?

So I turned ignition off, replaced the pipe from FPR to return pipe (which wasn't blocked), adjusted the FPR screw back in, switch on ignition, and the FPR guage shows 3 bar
Although it is showing 3 bar, it is very slowly dropping in pressure, so I'll check it again in half an hour and see if it has stabilised.

Maybe the blockage in the return pipe has cleared, maybe the FPR is temprimental

My head is starting to hurt now too, but it's cause of all the petrol fumes

[Edited by Scoty - 5/4/2003 1:39:54 PM]

 

Just checked it to see what the drop was and it's almost back to zero. I switched the ignition on and it went back up to 4bar.
Should my target be 3 bar just after switching the ignition on?

I havent changed anything apart from unblocking the breather hose an hour ago like you said m8, but nothing changed at that point

[Edited by Scoty - 5/4/2003 1:59:36 PM]

 

Done the parallel fuel mod and fitted a new FPR, but I can't get any pressure showing on the FPR.

When I turn on ignition, I visualy can see the fuel line going to the FPR getting pressurised, but no movement on the needle of the FPR, and fuel starts leaking just after injectors 3 at the turbo.

I've tried adjusting the screw while the pump is on, but it deos'nt make any difference.

It "sounds" like the FPR is on back to front or something but I'm prity sure it's on the right way.

Any ideas what could be causing the problem?

 

My FPR is fitted very similar to Fuzz's as in the picture above.
The yellow line would be the feed from the T between injector 3 and 4, and the red line represents the feed back to the tank from the FPR.

 

Im going to be fitting the above shortly. Do you not use the inlet to the left of the pressure gauge for anything? (next to the locking nuts for the adjustment)

 

Hi m8,

The small inlet nipple to the left of the gauge get's attached to the inlet manifold.

 

Fuzz's picture is correct mate..
First off take the FPR off and check that you can blow into the inlet on the FPR (where the Feed from the injectors goes) and get a clear blow out of where the fuel pressure gauge port is (with gauge removed).
There should be no restriction at all between where the gauge is and the inlet, even if the outlet line to the tank was blocked you would get readings on your gauge (very high ones).

Think that makes sense

It sounds as though there is a blockage either on the pipe from the injectors or in that port on the regulator..
The gauge port and inlet port on the FPR are linked with no restriction, that is why it doesnt matter which way round they go on either side of the FPR.

I'm not suggesting you do this, but ...

Take off the fuel feed to the FPR (injector pipe), place this pipe into an old milk bottle or suitable container. Whilst holding the bottle get a passer by to switch your ign. on and off quickly and the fuel should come out of that pipe at high pressure.
This will show you that the pipework up to the FPR is fine.

It really does sound like a blockage either at no. 3 inj onwards or the FPR.

Rob

 

Also take out the nipple on the FPR that the injector pipe goes onto and make sure it has a hole in it.

Rob

 

Cheers m8, I'm away to try it now

 

Morning Alan,

Could very well be a faulty gauge.

I took the FPR off just now and tried all Rob's recomendations and nothings blocked on the FPR. I can blow air easily through the FPR from fuel line in to guage in. Plenty petrol is getting to the FPR (tried it with an Irn Bru bottle)

The small leak at the adaptor after injector 3 was caused by the rubber o-ring gasket supplied with the FPR adaptor, now being half an o-ring, half of it is missing
I just pray it's not lodged in a fuel line somewhere.
I don't have the foggiest why it is damaged, was very carefull fitting it, but luckily I have the old rubber o-ring from the old FPR.

I'll put it all back together just now and see what it does with the fuel leak fixed.

 

Cheers Alan,

Must be a faulty gauge, still nothing happening, fuel leak is fixed though

Will it be safe to start car or best wait to see what pressure I'm getting at FPR?

 

Scott,

"0" rings can be pretty fragile, and it's not uncommon to damage them, particularly if there is any corrosion on the rail appature, or the ring isn't perfectly seated.

I would check the gauge first, by using a foot pump, or similar. I'm just wondering if the "missing" 1/2 of the "0" ring has lodged in the reg', jamming it open. The reg' is the first place after the adapter, and any bits of debrie (read "0" ring) will flow directly too it, and either back to the tank, or get stuck.

Mark.

 

Thanks Mark,

Disregard my last e-mail please, I checked the gauge with a foot pump and it is fine

I first took the gauge off the FPR and tried it with the foot pump, all was fine, and then put it back on the FPR and tried it with the foot pump and it's OK could only get 10psi though

Going to try and fit it to the fuel lines again and see what happens now.

 

Nup, still nothing, cant be getting enough fuel pressure, yet if I disconnect the FPR and put the fuel line into a bottle, switch the ingnition on for 1 sec, the bottles half full!!

I'll remove the fuel lines tomorrow and try and find the other half of the o-ring

Can't think it could be anything else

What prerssure am I looking for to show on the FPR gauge with just the ignition on (car not running) 3 bar?

 

Scott,

Right, I think you need to check the reg'. Can you take the reg' off, but leave the gauge fitted. Then, can you see if you can blow through it.

If you can, I suspect that a bit of "0" ring has got lodged on the seat.

Have you tried adjusting the reg' to see if you can get some pressure ?

Mark.

 

Mark,

If I adjust the res so that the adjusting screw is extended fully, I can blow though the FPR.

If I adjust the screw so that it is almost fully in to the FPR I cannot blow through the FPR and get sore cheeks trying

I have left the screw full extended, thinking that would be the best chance to let fuel flow through, but I take it I want to adjust the screw into the FPR to get pressure?

Scott

 

Morning,

Decided to place the guage into the fuel line on it's own after the T-peice before the FPR.
Switched on ignition, and got about 5 bar pressure registering on the gauge.

Had a look inside the FPR and.......nothing.
Nothing wedged or obstructing.

I could re-connect the FPR and block the line back to tank, then if I get pressure I know it's something to do with the line back to the tank?
Is it definately the top pipe out of the bulk head that is the return feed for the tank?

 

Mark YHM



When I cut the connection between the the top port on the FPR and the top pipe from the bulk head, the guage registers pressure.

 

Did you fit the gauge on the opposite side to where you fitted the return line? and not to the underside connection on the FPR?

Alan

Worst comes to the worst, you can try mine as car is off the road just now.

Alan

 

I'm maybe confused but you say on that diagram you have put the top port to the return. Should be the port on the bottom. See pic you posted earlier on.

Alan

 

The third one is a breather for the tank which goes to the carbon cannister.

If you've blocked it off, did you drill a small hole in the fuel cap?

Alan

 

On mine, the top pipe is the return.
Middle pipe is feed to fuel filter.
Bottom is breather which is still open and vents at the floor area of the car.

Alan

 

I've still to drill the hole in the cap m8, but I have left the petrol cap off for just now.

The pipe I am going to refer to below is the one purple line through it

If I disconnect that pipe from the FPR, I see pressure on the guage, so the FPR is working I think, but why would I not see any pressure on the guage when that pipe is re-connected?

 

I havent changed the order any of those pipes on my car m8, the bottom hose has always been connected to the filter

Anyone got a match

 

Is that the fuel filter?