hquick wrote:

Can anyone point me in the direction of where to buy a new reg? Perhaps the adjustable vette reg?

I could buy you a factroy Marine Regulator and ship it to you... its not adjustable though

Would you mind checking the price for me? I'm betting the word 'marine' doubles the price. Lol! (nothing to do with your fine military folks btw).
Reading the MONSTER thread....it appears the marine reg is set at 50psi...not 58 of our trucks/SUV's.
I may be better off going to the vette reg?!


EDIT: and btw.....time you changed your sig

Just saw that! haha will do.
I was thinking the fuel pressure went to 60psi @WOT with vacuum hose disconnected and 50 at idle
I will(try tomorrow at lunch) to check and see what price I can purchase it for through work if intrested.

here was a quick search online
http://www.boats.net/parts/search/Merc/Mercruiser/1998/4M4205MUS/Intake%20Manifold%20and%20Fuel%20Rail/parts.html

expensive like you said...

here is another brand (mallory)replacement
http://www.iboats.com/Fuel-Pressure-Regulator-for-Mercruiser-885174-Mallory/dm/view_id.710864

this sure looks like the same damn size
http://www.autopartswarehouse.com/details/QQChevroletQQTrailblazerQQDelphiQQFuel_Pressure_RegulatorQQ20032004QQDELFP10021.html?apwcid=P1135867996W43b3f85c7ab9e&apwidjOvm8rI

The marine regulator is a 4 bar 58psi unit, it allows for 58 psi at WOT or Key On Engine Off, but when it "sees" vacuum it lowers pressure to roughly 52 psi. The Stock L31 regulator allows for 66 psi with no cauum such as at WOT or KOEOff and 58-62 psi with vacuum.

peace
Hog

Thanks Pauly.
OK....I'd like to use one of these....but not sur it'll fit as the SC outlet runs really close to the reg.
Any ideas on dimensions/length of this reg?

http://www.proformance-motorsports.com/corvettes/engine/97-98-Adjustable-Fuel-Pressure-Regulator.html

Ive heard that the 1997-98 Vette regulaors will fit right in okace of the stocker.

peace
Hog

Yeah....pretty sure it'll plug straight in Pauly. Only issue is if there's 'room' to plug it in there...as I think it's a little longer than the stock unit.Think I'll get one anyway and give it a try.
Any idea where to buy? Best prices?

hquick wrote:

Yeah....pretty sure it'll plug straight in Pauly. Only issue is if there's 'room' to plug it in there...as I think it's a little longer than the stock unit.Think I'll get one anyway and give it a try.
Any idea where to buy? Best prices?

the 97 vette ACDELCO Part # 12554677 is right at $63 from Rock auto.

I can get a mercruiser one from work but you can almost do better online bc i only get 15% off list price and then its 7% tax so its really not a benefit for you. but if you do want me to send you one I will.

Thanks Robby....but I think I'll go the way of teh adjustable vette reg.
I'm assuming the one you listed as $63 isn't the adjustable unit?

hquick wrote:

Thanks Robby....but I think I'll go the way of teh adjustable vette reg.
I'm assuming the one you listed as $63 isn't the adjustable unit?

Nope, stock style replacement. Ill see if I can help find an adjustable one or one with the external demensions listed

Your help is greatly appreciated Robby (as is everybody's.....as always).

Well….just a few minutes ago I discovered something interesting.
When I built the initial fuel rails….I accidentally put a schrader/test point in the return rail.
Well….just a few minutes ago, as I was about to come into work (working a nightshift tonight) I took the little plastic cap off the return line schrader valve in order to see if my mechanical gauge fittings would screw on. I decided to keep the cap off (there’s a valve in the fitting so it shouldn’t leak) so I could measure things up at work.
I started the truck and started backing out the driveway when I smelled raw fuel. I wasn’t going to bother checking it but lucky I did.
I popped the bonnet and saw fuel ‘pouring’ out of that test point (on the return line).
Now….my question….
When I put the cap back on…..no more leak (it has an O'ring inside the cap....and obviously there's not a great deal of pressure there)….so that’s ok…..temporarily (I’ll fix it tomorrow….check if the valve is tight….or replace it).
Should there be that much fuel running through the return line at idle? How much fuel would normally be returning to the tank....or is that too ambiguous of a question?
I reckon I have fuel passing through the reg????

Yes, it'll be normal to have a lot of fuel on the return. The pump should be sending 100PSI to the regulator, which will then send the 55PSI or so to the injectors and the balance back to the tank. This means roughly half the fuel the pump sends up should be coming back, which is why the return line is only slightly smaller than the main line. I saw on some site once (may have been here) that the entire volume of the tank gets pumped through the fuel filter something like 9 times before it actually makes it to an injector.

Wow! OK...thanks Jim. Makes perfect sense.

To put it in perspective, let's say your pump is capable of supporting 400hp, but your engine only needs 10 to idle. Well then, 390 of those unburned horses will have to go back to the stable and that's, a lot of fuel...