502 mpi adjustable fuel pressure regulator
#1
Gold Member
Gold Member
Thread Starter
Join Date: Oct 2001
Location: Haslet, TX,USA
Posts: 1,936
Likes: 0
Received 0 Likes
on
0 Posts
502 mpi adjustable fuel pressure regulator
Does any one have excpience with this, how hard is the install? Can anyone explain it? I've installed headers and flame arrestor and I think I can avoid having my ecu done by doing this
#2
Banned
Gold Member
Join Date: Aug 2002
Location: IL
Posts: 5,660
Likes: 0
Received 0 Likes
on
0 Posts
You should have a regulator under the cooler housing cover:
http://www.mercruiserparts.com/Show_...ND+FUEL+COOLER
See the above. You'll need to remove the stock regulator and install an adapter fitting. I'll look up the part number. Once this is done, you can now install a different regulator, remember you want the regulator located high and close to the fuel rail.
http://www.mercruiserparts.com/Show_...ND+FUEL+COOLER
See the above. You'll need to remove the stock regulator and install an adapter fitting. I'll look up the part number. Once this is done, you can now install a different regulator, remember you want the regulator located high and close to the fuel rail.
#3
Banned
Gold Member
Join Date: Aug 2002
Location: IL
Posts: 5,660
Likes: 0
Received 0 Likes
on
0 Posts
What year engine do you have?
Here's one such regulator to replace the stock one:
Part No.: 620-15529
Hardin Marine Adjustable EFI/MPI Regulator for Late Model Mercruiser.
List Price: $69.95
http://www.cpperformance.com/
Here's one such regulator to replace the stock one:
Part No.: 620-15529
Hardin Marine Adjustable EFI/MPI Regulator for Late Model Mercruiser.
List Price: $69.95
http://www.cpperformance.com/
#4
Banned
Gold Member
Join Date: Aug 2002
Location: IL
Posts: 5,660
Likes: 0
Received 0 Likes
on
0 Posts
Vortec
Vortec sells the same similar type. Good info on their site:
http://www.vortechsuperchargers.com/...ptimizers.html
http://www.vortechsuperchargers.com/...ptimizers.html
#5
Platinum Member
Platinum Member
If you up the pressure more than six or seven psi, then you may need to upgrade your fuel pump. By all means put a fuel pressure gauge on the system so you can verify full pressure at WOT.
#7
I hate the winter!!
Platinum Member
Join Date: Jul 2001
Location: long island, new york
Posts: 2,707
Likes: 0
Received 0 Likes
on
0 Posts
I have the same situation as you do. Only with a '99 454 Magnum. I changed the exhaust, flame arrestor and added MSD6M-2 to the ignition. Last season, the plugs were a touch leaner than I would like them to be. Over the winter, I picked up a Vortech adjustable fuel regulator. I haven't put it on yet, but it seems easy. All you have to do is remove the stock regulator, cut the top off, and add on the new adjustable top. BUT, on my boat, I think I will be removing the entire fuel pump. It seeems easier than screwing around hanging upside down in the bilge. I also added a mechanical pressure guage to the back of the fuel rail. I want to monitor the pressure. Another reason for not putting the adjustable regulator on yet is because I want to get an accurate pressure reading with the old regulator before I modify it. When I start the motor in the spring, I'll get the readings and then put on the adjustable regulator.