Griffith 500 fuel rail

[Harvy500]

Is there a Schrader valve fitting on a Griffith 500 fuel rail to test the fuel pressure?

[Harvy500]

If it's the same or very similar to my Griffith this one is listed as being for a early V8 range rover.
I assume the fitting on the bottom left is said valve?

[Belle427]

They look like the flow and return hose connections to me, i cant answer where the schrader valve is on yours but it should have one.
The pre cat cars didnt have them but i think the 500 engine does.

[Loubaruch]

Harvy,
A snap of the shrader valve on my 1996 Griffith 500.

[Harvy500]

Mines a 1995 serp engine. I'll have a peek later.
Reason I'm asking is because I'm going to upgrade the injectors to multi hole ones and fit an adjustable fuel pressure regulator to ensure the fuel pressure is correct at 3 bar.

[Johno]

Harvy500 said:

Mines a 1995 serp engine. I'll have a peek later.
Reason I'm asking is because I'm going to upgrade the injectors to multi hole ones and fit an adjustable fuel pressure regulator to ensure the fuel pressure is correct at 3 bar.

It should have a shrader valve.

Why fit an adjustable regulator when you can buy a fixed rate one which is 3bar? Only asking as I have heard o fmore issues with adjustable ones not being consistent, or causing issues.

This is what your fuel rail likely looks like ...

Edited by Johno on Sunday 9th June 14:06

[Harvy500]

Cheap adjustable ones do have issues. A few cheap ones are not reliable.
In the past I bought a cheap one to fit to my Volvo 850R. It was highly tuned and the standard injectors can flow more if the tune requires them. Once it was misbehaving and leaked a little.
After that, I bit the bullet and bought a high quality Bosch one. For many years after that never had an issue.
Usual story, buy cheap buy twice (or more than twice if you don't learn by your mistakes).
If ever in the future my car has a mod or 2 that requires a little more fuel to redress the balance of air/fuel ratio it's a simple case of turn up the fuel pressure a little to balance it back. Not have to track down a set of injectors with a tiny little more flow rate.

[Johno]

You've got the experience then. I have just gone back to a rail mounted 3bar FPR - thankfully, having had a remote one for ages which I never liked. Found one I could confidently fit and it's working well.

[Harvy500]

I'm glad you're happy with the one you found. Remote ones are a bit dodgy.
I've ordered the adjustable one from Motorclan as they're a direct fit on the my cars fuel rail.

[eliot]

Harvy500 said:

If it's the same or very similar to my Griffith this one is listed as being for a early V8 range rover.
I assume the fitting on the bottom left is said valve?

That a p38 range rover rail - not a 14cux one.

[Harvy500]

Doesn't matter as long as my car has one. If you read my 1st message you can see it says 'assuming it's the same'. That's why I asked here and now I know what I wanted to know.

[eliot]

Harvy500 said:

Doesn't matter as long as my car has one. If you read my 1st message you can see it says 'assuming it's the same'. That's why I asked here and now I know what I wanted to know.

I was in the hot tub without my glasses on.
The standard 14cux wont work with the later p38 dead headed fuel rails. You can modify them to returned style with a fpr.

You check/set the fuel pressure with the engine turned off and forcing the fuel pump on.

[Sardonicus]

Just fit an 80's on BMW 3 BAR unit in Pierburg or Bosch and last forever fit straight onto the Lucas Hotwire fuel rail