1997-1999 4.0 OHV fuel rail differences

[zwsmith81]

I need some help on this fuel rail, regulator, top plenum clearance issues. I’m doing a 99 non egr 4.0 OHV swap in my 97 egr 4.0 OHV. My 97 has the two fuel lines. The 99 has one line with a smaller regulator at the supply port. I swapped the 97 fuel rail on to the 99 so I had my return line. Now my non egr plenum is hitting the regulator and won’t bolt up. Has anyone else ran into this issue? Should I try to upgrade my fuel pump to the single line like the 99 or is there a way to modify the plenum to fit over the 97 regulator?

 

[zwsmith81]

Disregard this, I just figured out what I did wrong!!

 

[Snoranger]

That’s not a regulator on the 99 return less fuel system rails. That a pulse damper. It’s basically a small accumulator that absorbs the pressure spike in the system as the injectors close.

 

[gaz]

@zwsmith81
Why not use the 97 intakes and fuel system on the 99 engine?

 

[zwsmith81]

That’s not a regulator on the 99 return less fuel system rails. That a pulse damper. It’s basically a small accumulator that absorbs the pressure spike in the system as the injectors close.

That’s a good thing to know. Thanks!

 

[zwsmith81]

@zwsmith81
Why not use the 97 intakes and fuel system on the 99 engine?

That’s what I’m doing. I had a total brain fart and had installed the fuel rail backwards. That’s why the plenum hit the regulator. Switched it around and everything bolted right up!