Hey all, I have a question regarding the Sard FPR.

Long story is, paid a workshop to do some work and a Sard FPR was part of the deal. Basically, workshop outsourced stuff they couldn't do (at my additional expense) and due to the complete **** around (3 months of it), I ended up picking my car up and finishing it myself.

Once the car was running, a fuel pressure gauge was connected to adjust the Sard FPR. Now the reading was actually pulsating. It was spiking rapidly between 0 & ~42psi. Now I wasn't sure if this was normal or not so did some more research and confirmed it certainly wasn't.

I took it back and asked for it to be fixed and $550 later, it was. (FPR was replaced).

I was told that because 'he' couldn't finish the work, he wasn't able to monitor the vitals on first crank (not a rebuild, a transplant) and that I'd damaged the FPR.

I refuse to accept this and am fighting the invoice. Either an FPR will work or it won't. I can't see how anything I've done has caused this. I am certain it was not installed correctly (inlet and outlet connected the wrong way round) as the fuel pump did not sound happy. Meanwhile the dodgy 'subaru specialist' has probably re-used it on another vehicle.

I'm not able to find a manual for the Sard FPR so need some expertise to confirm my suspicions.

Thanks in advance!
Johnno.

which workshop?

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I prefer not to say at this stage. It's not in WA though.

who fitted the reg?

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Ummm, the workshop did.

search for my pdf on fuel pressure regulators. it may explain the pressures a bit easier.

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Long live the WRC

All I need is confirmation that the symptoms point to the FPR being connected wrong.

That's it!

I'm saying that due to the fluctuation in pressure (rapid fluctuation) he must've got the inlet and outlet the wrong way round. I mean, the rapid oscillation was in time with the injector pulse.

I am certain he put the FPR before the injectors when it should be the other way around.

Understand?

...hard to say, never connected one the wrong way round but have heard of it being done !(can`t remeber what it did to pressure but except just not work right !)

How about you swap the way yours is connected around and try replicate the problem/what you saw on the pressure gauge....then you`ll know !

Pretty hard to 'break' a regulator all it is is:

a diaphram,
a spring
and a fixed return orrifice.....Not a lot to go wrong really.......

Yes, it should be in the return line after the injectors....... unless someone has set up a fixed orrifice return from the rails or it's a 3 port regulator with no return from the rails (bad mkay!).


Fluctuating pressure maybe because the reg has been unwound all the way and is not trying to hold a high enough pressure ?

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Why are you running an aftermarket reg anyway?

It's generally accepted that the stock fuel reg is fine.