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Technical Fuel pressure regulator

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Technical Fuel pressure regulator

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skeets

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Hi All, long time lurker and Fiat newbie here...

I have a 2004 1.2 Panda dynamic which is running rich. However, when I increase the rpm, the fuel trims come back into line, so I thought I would check out the fuel pressure regulator, but I couldn't see it under the bonnet.

Is the regulator actually a part of the fuel pump?
If that is the case, how does the regulator know the engine load? Is there a vacuum pipe going to it or is it electrically actuated?

Thanks in advance
 
Just noticed this has gone unanswered. Hopefully someone will be along shortly.

In the tank as far as I know.


Never had to replace one so can't help with your other questions
 
skeets said:
Hi All, long time lurker and Fiat newbie here...

I have a 2004 1.2 Panda dynamic which is running rich. However, when I increase the rpm, the fuel trims come back into line, so I thought I would check out the fuel pressure regulator, but I couldn't see it under the bonnet.

Is the regulator actually a part of the fuel pump?
If that is the case, how does the regulator know the engine load? Is there a vacuum pipe going to it or is it electrically actuated?

Thanks in advance
Click to expand...

have a read;
https://www.fiatforum.com/punto-mk1...mbly-replacement-punto-1-1-spi.html?p=4257783

I'd have thought the fuel rail returned unused flow back down the lines..

I've not looked.. but does the ECU show rail pressure..??

Charlie - 1.1 Active
 
Thanks for the pointer. it was an interesting read. I suspect that I'll end up taking out the pump and working it out the old fashioned way when I have the car next weekend.

I couldn't see a fuel pressure PID on my scan tool. Luckily, there appears to be a Schrader valve on the fuel rail though, so my next port of call will be to get my shiny new fuel pressure tester on that :D

I suppose that there must be a return line. I was just curious as to how the regulator knew the engine load so I could mess with it and get an indication of whether the regulator was at fault before taking the pump out.

If there is a better way of testing the regulator, I'll do a write-up for future reference.
 
Doubt the problem will be in this part. With all the Punto threads as well can't find any where rich at idle was due to the regulator.


Personally I would suspect the problem will be in the manifold air pressure, ambient temperature and lambda loop somewhere.


Luckily the values of these are readable without spending on new parts.


Ambient temperature should read the same as Google says you town is then rise as the engine heats up. Known to cause rich running. As is the pre cat lambda and some third party replacements.
 
Thanks Koalar, I did check these. Granted I didn't have the specs with me, but the MAP was behaving exactly as I would have expected it to, IAT looked sensible and I think that to see the trims that I'm seeing, they would have to be way out. As for lambda,both sensors are indicating very rich.
Interesting what you say about the regulator on the Punto. I had wondered how similar the Panda and Punto are. I guess when I get to check the fuel rail, that will tell me whether to take the pump out or revisit the sensors.
 
If anyone is interested in what the fault was. I had the car around last weekend and was able to get it in the garage for a good once over.

I found a blue pipe, which I suspected might be a vacuum feed to the regulator. Well, it turned out to be an evap line. When I unplugged it, the car started behaving itself. So, 2 min's later, I had put the vacuum gauge on the evap valve and it didn't hold any vacuum at all! So, it turns out the manifold was sucking in fumes from the fuel tank all the time.

The local Fiat stealer wanted about £250 for a new valve! so I took the chance on a second hand one from fleabay and for the sum of £20 the problem is now solved. :D

I hope someone finds this of some use!
 
skeets said:
If anyone is interested in what the fault was. I had the car around last weekend and was able to get it in the garage for a good once over.

I found a blue pipe, which I suspected might be a vacuum feed to the regulator. Well, it turned out to be an evap line. When I unplugged it, the car started behaving itself. So, 2 min's later, I had put the vacuum gauge on the evap valve and it didn't hold any vacuum at all! So, it turns out the manifold was sucking in fumes from the fuel tank all the time.

The local Fiat stealer wanted about £250 for a new valve! so I took the chance on a second hand one from fleabay and for the sum of £20 the problem is now solved. :D

I hope someone finds this of some use!
Click to expand...


I found that helpful. Thanks
 
MAP sensors are cheap so worth swapping out. But running rich can be caused by a spark plug missfire. Basically - the ECU sees the unburnt oxygen (from when the spark didn't arrive) so richens the air/fuel mixture.

Unless you know they are new, change the plugs and see what happens. You "could" change the coils and leads but they really are very reliable so not top of my list.

MulitECUscan and OBD cable would find your fault.
 
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