158 replies to this topic

[pete-r]

If it's just piping, we can asume the tmap part is setup correctly.  

It looks like a 90deg barb connector.

[Chris P Duck]

Ok so to be clear Bargi = butterfly more open than normal Chris P Duck = butterfly more closed than normal Pete-r = butterfly more closed than normal I don't have any way of measuring the fuel pressure I'm afraid Pete. When I change the injectors earlier there was no squirt of fuel when I depressurised which was about 10 mins after it ran. But it did hiss so there was pressure and there was fuel in the rail when I removed it. I don't know if this is normal however.

[Exmantaa]

Nope, no Saab components here. O ring retrieved, gasket cut, manifold back on, SC back on (better but still not 100% convinced as I can still see the green gasket on the bypass part) VXR injectors in the fuel rail. Just need some VXR injector wiring plugs now, any suggestions where I can get some from?

 

Did you put some (light coat) silic. gasket stuff around the modified PCV hole? Otherwise it might leak there...

[pete-r]

I don't have any way of measuring the fuel pressure I'm afraid Pete. When I change the injectors earlier there was no squirt of fuel when I depressurised which was about 10 mins after it ran. But it did hiss so there was pressure and there was fuel in the rail when I removed it. I don't know if this is normal however.

I'm not sure that's right, Peter and my local lotus specialist told me that even hours after the engine is stopped there should be fuel coming out of there. Mine is dry within moments of turn-off. Also check the valve when primed, there should be fuel in that pipe but I get nothing, so until that's fixed there's little point me looking further. Might save you messing with more complex things if it's something simple. Did you have your pump replaced during the SC work like I did?

Edited by pete-r, 21 August 2014 - 09:55 PM.

[CHILL Gone DUTCH]

http://www.speedster...ings/index.html

 

here is a diagram of fuel system

[pete-r]

Nice one Chris. It's pretty obvious then, that I should have fuel flying out of the valve when the ignition is on if the pump is working and there's no leaks, but I get nothing at all! I think I need to sort that before looking at the ecu, tb and gaskets and other stuff. Do you agree?

[Chris P Duck]

Did you have your pump replaced during the SC work like I did?

Yep for a Walbro 255. Can anyone confirm that fuel should squirt after priming and after turning off? Be useful to know for certain what is normal before we assume this is the problem. I certainly can't see how this could be linked to the butterfly position?

Did you put some (light coat) silic. gasket stuff around the modified PCV hole? Otherwise it might leak there...

No :-(

[CHILL Gone DUTCH]

Have you tried the valve with engine running ? I'm going to investigate mine in the morning as it's a little late now Will let you know what I find Tomoz

[CHILL Gone DUTCH]

When I tried it for peter the other day I only got a hiss and a small amount of fuel ( next to nothing ) Just wondering if the pressure ( and pump ) is also linked to the injectors opening and closing

[pete-r]

It has to have fuel in the feeder pipe, and under pressure at that, when priming. That's the point of the pump priming it's pushing a stream of fuel up to the rail isn't it? So whether it's a dribble, or a jet you should have something but mine is dry so either no prime or the pressure it negligible. With mine, on prime it's just air, when running fuel flows out, and turned off it's air after just a few moments.

[Chris P Duck]

Nice one Chris. It's pretty obvious then, that I should have fuel flying out of the valve when the ignition is on if the pump is working and there's no leaks, but I get nothing at all! I think I need to sort that before looking at the ecu, tb and gaskets and other stuff. Do you agree?

Lack of fuel is certainly what it feels like when I try to start it. Just can't work out how that would lead to a more closed TB Or how it would be ok on the CS map would be ok (unless we' re assuming our prob is different to Bargi's?)

[CHILL Gone DUTCH]

Can you get someone to turn ignition on while your ( priming ) while your pushing the nipple But I am thinking you could be right here peter But I'm no expert so hopefully there will be someone along shortly to give a definite answer

[pete-r]

Less fuel = less air to prevent running lean maybe? So close the throttle? Or there's an air leak adding to the air mix? I think definitely get fuel up to the rail is the first step before you start swapping injectors. How it works on the CS map I don't know, did you change the pump at a different time to the map?

Edited by pete-r, 21 August 2014 - 10:22 PM.

[Chris P Duck]

How it works on the CS map I don't know, did you change the pump at a different time to the map?

I've never run a CS map. That was Bargi

Recently switched to the Dutch ECU and finding cold starting takes a good 3-4 seconds for the engine to catch. Swapping back to the CS mapped ECU it kicks over without issue.  

But as before, we may have different problems

[pete-r]

That's true. Either way there needs to be fuel in that pipe and coming out of the valve at pressure so check that tomorrow. Bargi seems to have something a little more in depth maybe? I was told some of the CS sensors are deactivated so maybe something to bear in mind.

[smiley]

 

I'm not sure that's right, Peter and my local lotus specialist told me that even hours after the engine is stopped there should be fuel coming out of there. Mine is dry within moments of turn-off.

 

When i did my walbro conversion i noticed very limited space in the pump housing, and had to twist my walbro in a specific way in order for the flexi piping not to scrape any other parts.

 

At this point i would start thinking about pulling the pump housing out and inspect it.

[CHILL Gone DUTCH]

Just a quick question to chrisPduck did you check the air dump butterfly was fully closed when you took the charger off??

[CHILL Gone DUTCH]

If this is not closed it could be stopping the fuel regulator from working

[Exmantaa]

Are we talking about a replaced in-tank Walbr0 fuelpump? I remember one that had a split hose in the pump unit and almost no fuelpressure due to that. Siomply buy/borrow a pressure tester and check the rail pressure..

[smiley]

I remember one that had a split hose in the pump unit and almost no fuelpressure due to that.

 

He had that twice.   (if we're talking about the yelllow winged one)