I just got the Bosch injectors from Jon, and now the mechanic says we need a fuel regulator as well. Is this a common problem, and is 325$ the average amount they cost. Seems like a lot for what it is. Any photos of one. Thanks guys.......K

 

You can order the regulator diaphram from your local auto parts store.

 

Is it hard to install......the kit I mean?

 

What kit are you referring to? If you are replacing the injectors, then the regulator will be right there, and would be the best time to replace it. It would also be a good time to replace the orings in the fuel rail that you can buy from Jon. Also the orings on the fuel lines at the rail that you can get from the dealer.

 

Well they sell a rebuild kit for the reg like you say for 50$ or the reg for 325. How long to put the kit/diaphram into the old reg after it's out. Does the kit contains all the O-rings as well, I haven't picked it up yet.

 

The diaphram is about 40 bucks and an adjustable fuel pressure regulator is about 50-60 dollars....Where is this 325 dollars coming from?

 

It's coming from the local auto parts store, and the dealer's about the same. Is the one you speak of OEM, or what brand and where can I get it....? thanks, by the way, guys.

 

Your regulator is just a metal cap with a diaphragm that is the only part thet goes bad. Sometimes the Vacuum connector can break. Then you have to replace the cap.

Diaphragm

http://www.summitracing.com/parts/SMP-PR10



Cap Adjustable

http://www.summitracing.com/parts/MAA-4315/?rtype=10



How to do it

1. remove intake plenum, (top half of intake). Remove the bolts that bolt it to the intake runners. It may
be necessary to loosen the runners at the manifold to remove the plenum.
2. CAUTION!!!...... .. Release any fuel pressure in the system by pressing By starting the car with the fuel pump fuse pulled. Let the car idle until it dies.
the fuel rail (resembles a tire valve), and put a rag over the valve and cover it before you press on the
valve to avoid fuel being sprayed all over!!!
3. The stock fuel pressure regulator is located at the rear of the fuel rail. Remove the 6 torx head screws
that hold the stock regulator in place. 'This is UNDER SPRING PRESSURE. BE CAREFUL WHEN REMOVING
THE REGULATOR OR IT COULD FLY OFF!!!
4. Reassemble the regulator diaphragm and parts the same way they came out of the stock regulator
into the adjustable regulator and replace the 6 torx screws,
5. Reverse the plenum dis assembly procedures and reinstall the plenum with the gaskets supplied. It is
not necessary to use any type of sealer with these gaskets.

6. Connect a fuel pressure gauge to the Shrader Valve, turn the key on and check for fuel leaks. Set the
fuel pressure to the recommended 42-46 PSI by adjusting the screw on top of the regulator up or
down.
7. Two final cautions ....
1. Most of the parts that your are working with are aluminum .., THERE IS NO NEED TO OVER
TIGHTEN ANYTHING!!
2. Please take all precautions when working with any fuel system, IT IS FLAMMABLE!!!

 

You just order the diaphram and unbolt the top/cap and replace the diaphram. Doesn't take too long once you have the plenum off.

I believe you need a T10 security torx. You can get it at Autozone in a set. It will have a hole in the middle of the torx so you can take the regulator bolts off.

If you want to replace the fuel rail orings, order them from Jon. And get the 2 fuel line orings for the lines that bolt to the fuel rail from the dealer.

 

These parts are MADE in the USA. Good stuff below.

Adjustable Fuel Pressure Regulator(better than factory!)

http://www.tpis.com/parts/view/16

Diaphram:

http://www.tpis.com/parts/view/15

 

My local, So Cal Corvette wrench did mine for under $70. I was having starting issues when if was hot. Fires up perfectly every time now.

$325???

 

Ive beent trying to figure out who the hell would charge 325 for a regulator. Napa here sells a OEM type one WITH A WARRANTY for 90.00 dollars. Autozone sells the OEM regulator for 40 here( cheaply made, piece of junk). The guy said it's not a "popular part" so they are cheap. I don't trust him but I did see the screen for the part and indeed it is the right part for the right price...Just a very very cheap poorly put together piece.

Napas looked excellent! I still like TPIS.com parts though. Top notch parts made in the USA.

 

Is that $325 for the part ALONE? If so, ask him if he supplies the KY or whether you have to bring it yourself.

If it is $325 INSTALLED, it might be different since you might have to take the intake manifold off. Also you have to take the fuel rail off for the new injectors.

Please be specific.

 

You don't need to take the intake off to do the injectors or regulator.

The mechanic could be referring to replacing the regulator as a unit as it is more expensive and more involved than just doing the diaphram:

 

Unless he broke it, I have never seen one go bad.

 

Did he say just why the fuel pressure regulator has to be replaced? Is the measured fuel pressure out of spec? Did you get injectors with a higher flow rate that may require higher fuel pressure?

From the price quote, it sounds like it's the part and labor for doing that work only. Replacing the injectors and the o-rings means you have to take the runners off, and when you do that, the regulator is exposed. Your "mechanic" is screwing you over.....

You can replace the entire stock regulator (AC Delco p/n 21-7380) or the diaphragm and spring (AC Delco p/n 21-42156) and rebuild your own. FWIW the regulator on the L98 is the same as found on the L98 in F-body cars.

If anything, I would replace the fuel filter and if fuel pressure is where it should be, leave the regulator alone.

 

Replace fuel filter before you install those new injectors.How did they determine the fuel pressure regulator is bad?Wouldn't be a bad idea to replace(recommended) if uncertain of the last time it was replaced but may not be nessessary(needed).As a Technician,I know shops normally charge more for parts than it would cost you to buy the part(s) personally.Its a business after all.I'm assuming that large bill is for parts & labor.If its just for the part,run for the hills.If your near Minneapolis I can install & get your parts for 1/3 to 1/2 of what a shop charges.Keep us posted

 

This is my car-dumb friend's car, who I am trying to help by the way, I would have bought the diaphram and installed it if it was mine. But the parts joints here, and I talked to them, had only 2 items available right away, and remember this is Canada, one was the kit or diaphram, for 50$, but the GM dealer told me they don't install those, only the whole unit (a-hole greedy bastiches). The second part available was the whole unit as this...... @325$. He did it, more money than brains, and the dealer charged him 500$ to install FIC's 169$ injectors and this unit. However, it was cheaper than the original 2500$ they quoted him to replace just the injectors, that would have been 2825$ plus tax including reg. I think he must walk funny now........ Thanks for the help, now I have the old one to rebuild. My bonus, haha.

 

Learn to work on your cars people....