'03 5.7 LTR Pressure Regulator

[Fullpass]

I have a 197 with a 5.7 LTR Indmar GM Vortec. Can I buy the fuel pressure regulator at the auto store...part number, store. What is the bar pressure for regulator...anybody know what year Gm motor I would be looking at...fuel injected motor.

The fuel pressure regulator is located on the right side of the motor on the fuel injector rail.

also will be replacing knock sensor due to corrosion, I see that can be replaced, look for number on part, would it be the same for pressure regulator? thanks

[Engine Nut]

The Indmar P/N for that regulator is 556125. It is a vacuum actuated 3 Bar regulator ... approx. 45 PSI.

[Fullpass]

Thanks for the information Engine Nut

[mikeg205]

I believe this will work as well. http://www.napaonline.com/Catalog/Ca...732_0462420664

kit available at most auto parts stores...

[mikeg205]

I believe this will work as well.

http://www.rockauto.com/dbphp/x,catalog,154,partnum,PR286,d,STANDARD_MOTOR_PRODUCTS_PR286.html

search these part numbers you can prolly sourced locally...

PR286, PR234, PR92T, PR216T, PR105T

http://www.napaonline.com/Catalog/Result.aspx?Ntt%3dfuel%2bregulator%26Ntk%3dKeyword%26Nty%3d1%26N%3d599001%2b101994%2b50012%2b2012030

kit available at most auto parts stores...

about 25% of the cost at a marine parts store...

[Fullpass]

2003 INDMAR 5.7 LTR 330 hp 3 bar 45psi fuel pressure regulator ALTERNATIVE REPACEMENT PART#: OEM GM 17089203 (EXACT REPLACEMENT), NAPA #: CRB 219613, reference engine for parts ~ 1994 Cadillac Deville 4.6L 281 NOT THE 4.9L

[jamis0n]

2003 INDMAR 5.7 LTR 330 hp 3 bar 45psi fuel pressure regulator ALTERNATIVE REPACEMENT PART#: OEM GM 17089203 (EXACT REPLACEMENT), NAPA #: CRB 219613, reference engine for parts ~ 1994 Cadillac Deville 4.6L 281 NOT THE 4.9L

@Fullpass - Same part for a 2000 XStar 5.7L 330HP LTR? I suspect so but wanna double check.

Thanks!

[whiskeyriver]

Yeppity yep

[Cumminscj]

Maybe you guys can point me in the right direction here, but on my year 2000 LTR where the fuel pressure regulator should be there is something that looks like a regulator, but there is no fuel return line going anywhere. What is it doing? It doesn't seem like it could regulate fuel pressure since there is no return line to the tank.

[whiskeyriver]

Maybe you guys can point me in the right direction here, but on my year 2000 LTR where the fuel pressure regulator should be there is something that looks like a regulator, but there is no fuel return line going anywhere. What is it doing? It doesn't seem like it could regulate fuel pressure since there is no return line to the tank.

I've spent the last couple years researching this, what your seeing is in fact the GM fuel pressure regulator. If there is no return line attached it has a plug installed in the port where the fuel line would go. (Bottom of reg.) In this case the regulator does nothing. Indmar just left it there to plug the hole in the fuel rail. I am surprised that you have a 2000 model year with a returnless system. According to indmar, early production 1999 LTR was returnless. Late 1999-2000 began utilizing the return. This continued until end of production for the LTR.
In my endless research, yours will be the first and only 2000 model year LTR that I have come across that did not have a return. That's interesting. If you would be willing to PM me your hull# and engine serial# I'd love to research that a bit.

[Cumminscj]

Possible it is late 99. Hole in throttle plate. Will be at the lake this weekend and check it. That is really dad's boat so i may have incorrectly remembered the year. I run that on weekends and the Marlin during the week here at the house.

[whiskeyriver]

I'm very interested, let me know what you find.

[jamis0n]

My 2000 XStar with LTR has 2 orange fuel lines coming from the fuel pump module, so I'm pretty sure that means it utilizes the return system.

Does that mean then that my fuel pressure regulator is in fact the GM one at the end of the fuel rail?

[whiskeyriver]

My 2000 XStar with LTR has 2 orange fuel lines coming from the fuel pump module, so I'm pretty sure that means it utilizes the return system.

Does that mean then that my fuel pressure regulator is in fact the GM one at the end of the fuel rail?

You have two, one at the tank and one on the fuel rail. Let's go back to your "engine stutters on hard acceleration" thread and keep it there. Two threads are confusing me...lol

[mtajpa]

Digging Deep to revive this post as it has some great info about the LTR fuel rail mounted pressure regulator. The only thing I could see missing from this post is the WHY did OP want to replace.

So my issue has been occurring for a while and getting worse. I have a 1999 Maristar with the LTR. The LTR would start first time when cold and run flawless until you would shut down for a short time. It would then not restart unless you gave it a wide open throttle. Like the engine was flooded. Fuel pressures , spark, were all checked at times of no start and verified to be good. The flooded condition was being caused by a failed diaphragm in the fuelrail mounted regulator that gets its vacuum from the intake manifold. My system is a returnless type system so this regulator is not doing anything other than plugging the hole in the fuel rail. I found that when it shut done the remaining engine vacuum would suck the fuel from the rail into the intake flooding the engine. The fuel pressure could be seen slightly dropping to about 20 psi over a 15 minute period. I had previously thought this could be the injectors leaking and removed cleaned, tested to eliminate that issue.
The actual pressure loss was due to the bad regulator. If I would have pulled the vacuum line off the intake manifold I would have found this problem sooner.

Long story short. If you have hard starting problems and notice a small loss of fuel pressure when shutting down. Pull the vacuum line off the intake and plug both ends and see if that solves the problem. I did this and my issues were solved. My vacuum when pulled was full of fuel.

I did replace the regulator with the Napa part number 219613 it was 73 bucks at the local store.

Thanks to all the contributed to this post. Including Engine Nut who I emailed at Indmar with a question and he responded right away.
Hope this helps future LTR owners.