Passenger injector removal – MPS in the way, No clearance to pull rail/injectors – workaround? Options

[Stef914]

Happy Sunday everyone,

I recently enquired about fuel injector elbows after detecting a fuel leak on injector #4 for the second time in the last 6 months or so.

I’ve only been about 90% sure that the leak is coming from the elbow, and since these are basically impossible to find (Tangerine, Pelican, AA, PMB, 914 Rubber, eBay… nobody seems to have them), I decided—for peace of mind—to go ahead and replace all 4 injectors to eliminate that remaining 10% doubt as well. Also, according to my records (and I have quite a few), they were last replaced in 1992.

I’ve already ordered 4 STANDARD MOTOR PRODUCTS FJ67 injectors and a set of BECK/ARNLEY seals (O-rings) from RockAuto.

The job seems fairly straightforward on the driver side, where everything is relatively clean and there’s at least “some” space. My plan there is to disconnect the rail, remove the injectors, bring everything to the bench, reassemble the rail with the new injectors, replace the crimp connectors with FI hose clamps, and reinstall everything with new seals/O-rings.

I’m also considering replacing the fuel rails with new ones. Back in 1992, the shop apparently installed a driver-side rail on the passenger side and capped the top tube. So I may either replace both driver and passenger rails with new ones or source a correct passenger-side rail from eBay.


Now, here’s where I’m running into an issue.

On the passenger side, there is essentially no room to remove the injectors and rail due to the manifold pressure sensor (MPS) and the fuel pressure regulator sitting directly above that area.

I understand the MPS is not something you want to mess with, which I’m definitely trying to avoid. However, in order to gain enough clearance to remove the injectors and rail, it seems like I may need to move that assembly out of the way.

So my questions are:

Has anyone successfully removed the passenger-side injectors and rail without removing the MPS? If so, what approach did you use?
Is it typically enough to remove just the fuel pressure regulator and slightly reposition/tilt the MPS to gain access?
Or do the MPS and pressure regulator need to be removed together as a unit?
If removal is required, is it better to remove the pressure regulator first, then the MPS, or handle them together?

So far, I’ve only identified one Phillips screw and one nut holding the assembly in place. The nut on top seems to secure the pressure regulator to a bracket, which also supports the MPS, and the Phillips screw below appears to secure the MPS to that same bracket (I believe). I’ve attached photos for reference.

Also, are there any absolute “do not do” items or things to be particularly careful with when working around or handling the MPS? I understand it’s a sensitive and critical component, so I’d really like to avoid damaging or misadjusting it.

I’ve gone through previous posts, the PET, Haynes manual, and a number of YouTube videos, but most of them make the job look easier than it actually is and don’t really address the lack of space or how to work around it on the passenger side.

As it stands, the main issue is simply the lack of clearance to safely remove the injectors and rail.

Any input or real-world tips would be greatly appreciated!

[mgphoto]

It isn’t the pressure regulator it’s the de accl valve.


Removal repair replace standard operating procedure.
Space in the 914 engine bay is tight to say the least. Each item can be removed without disturbing any settings. Your MPS doesn’t seem to be adjustable so no harm possible. The hose configuration should be your worry as they have to be connected correctly.

[Stef914]

I was just going off what PET calls it (#7 on the diagram). If that’s actually the decel valve, that makes sense—either way, that’s one of the pieces blocking access (IMG:style_emoticons/default/piratenanner.gif)

Thanks for the inputs Mike !

It isn’t the pressure regulator it’s the de accl valve.

[fiacra]

I agree -- you got to remove stuff to get to stuff. Just the nature of the beast. Take a lot of pictures, label things, take your time, etc. It's unlikely you're going to cause any harm to any of the components. More likely you will accidentally disconnect something, so be sure to check all connections before, during, and after. And before anyone else says it, make sure to use the correct clamps for the fuel lines or you run the risk of compromising the line and creating a leak.