Fuel Pressure regulator question

OK, 2 ideas -

How about a used one? Maybe ferrparts or someone?

What is actually wrong with yours? Maybe you can rebuild them?

 

I have a used one in perfect condition...it is the factory original $1000 one and not the aftermarket version that is sold by Rockauto.

These units cannot be rebuilt.

 

Bosch part 0280 160 731

Same part used on Volvo 960 or S90
Also used on Alfa and Renault.

Please chck 348 parts interchange sticky.

Good luck.

 

This link looks right
http://www.ebay.co.uk/itm/FUEL-PRESSURE-REGULATOR-ALFA-SPIDER-VOLVO-960-S90-V90-RENAULT-FERRARI-348-/310351649066?pt=Motors_Car_Truck_Parts_Accessories&hash=item484266592a

 

I still wonder what went wrong inside of it? Is it the diaphragm that is ruptured?

 

You should still be able to find an equivalent part for another vehicle. These things are never Ferrari-specific. Can you get the specs on the part? What psi or bar does it have and what are the connector sizes? I am sure you can come up with a more affordable replacement than stock.

 

If the diaphragm is ruptured, you could try swapping it - the reg. body looks the same as almost every other Bosch reg out there. This would involve uncrimping the canister and changing the diaphragm, not easy, but I have done it in the past.

 

Did rockauto not have an ETA on the part?

 

What happens when one of these regulators goes bad? Does the car run poorly or is it just hard to start?

 

Sorry I was late to see you posted this - YES - you could have easily gotten a pair of adjustable regulators from aeromotive or AEM or SX - they may even have them with the correct spacing or have an adapter to bolt them up.

 

I would think that if the diaphragm is ruptured it may cause fuel to shoot up the vacuum lines - I have seem this on a car before.

 

on my previous 348 when the regulator failed there was raw fuel in the vacuum lines,
which on most occasions would dump raw fuel into the plenum and it was bear to get the thing started when hot (flooding comes to mind).
the other unique thing that it fixed when I replaced them was the sometimes annoying stumble at idle when extra fuel would make its way in to the intake....
the vacuum lines on the 348 are connected to the plenum as I can remember.

yeah that cleared up a few issues with that car....
along with a bunch of other things

you can check if they are leaking by pulling off the vacuum line after you run the car awhile.
on the 348 I got the regulators from bosche

 

Fab if you see this what was the symptoms
Bad starting/?
You never did tell us.

 

I found these once and I haven't tried them. I don't think any of us have.
But they claim it's a replacement for the PN that you and I need:
https://spaturbousa.com/products/ferrari-355-456-550-512-in-rail-adjustable-fuel-pressure-regulator-e85-safe?_pos=1&_sid=d86253f86&_ss=r

 

Dam that doesn’t help
Thanks anyway

 

Just thought I would chime in. I just recently replaced my fuel pressure regulators on my 348 which actually has 2. One side was leaking so bad that was flooding the engine and almost impossible to start hot, plus I could smell raw fuel after shut down. I thought for sure I needed the dreaded repacking of the clutch but all along it was the fuel pressure regulator. Anyway these are very very hard to come by now.... Ferrari wants $960 you can find them around $500 to $600 on eBay. Even then you might be buying a 30 year old part that is new old stock. Anyway, after many many many hours of searching, research and ordering parts and checking the fitting sizes, I was able to source an FPR from Brazil at a reasonable price and I'm selling them on eBay. These are an exact replica of the original bosch and a drop in replacement with 3.8 bar pressure. But again this is for the 348 1992 on. What I learned in my searches is these regulators have a metric inverted flare fitting which is unique for fuel. Moreover there are companies that sell adapters, for example that can change a fitting from say, 14 mm to 16 mm so forth and so on. I've got a lot of time on my hands so I'm going to try to source one for the 355 and will report back if I have any luck.

 

Does anybody have any specs on this fuel pressure regulator for the 355?? Specifically how many bar and the thread size it looks to be 14 x1.5 mm or possibly 16x1.5mm reverse flare.

 

That year 348 uses 3.4 bar not 3.8 btw.


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That's interesting to know. What I found was 1990-1992 348 use a barbed FPR which was actually 3.0 bar. Then mid production from 92 to 95 switched to a nonbarbed 3.8 bar. I can't magine that would be of significance but it's good to know. I'm still trying to find out the exact specs of the 355 fpr. At this point I believe it to be 3.5bar which is 50psi

 

Plenty of 348 FPR threads as well as 355 FPR threads. I would be you can order standard Products FPR for 355 from Rock auto. Isn't the 355 original FRP marked for 3.9 bar?

 

I don't think there was any 3.4 Bar FPR on the 348. Most had 3.0 Bar and only some Spiders had 3.8.
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