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  #1  
Old August 19th, 2011, 10:15 PM
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Checking Fuel Pressure

For those of you who have done it where did you tap into the fuel line at? Since we don't have the Schrader valve in the fuel rail like every other vehicle in production it makes it a little more challenging.
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Old August 19th, 2011, 10:23 PM
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The factory method was an adapter piece that you install in place of the fuel filter, check the pressure and then put the filter back in.

Later rover vehicles had a different fuel rail with a schraeder valve in it. Have one sitting around somewhere, never got around to installing it.

-Hans
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  #3  
Old August 19th, 2011, 10:35 PM
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Yeah, I was afraid you were going to say that. When I bought my gauge set my snapon rep tried to sell me a filter adaptor. You would think for 500 bucks it would have been included in the kit...

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Old August 20th, 2011, 10:22 AM
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OTC makes a filter adapter for earliy 90's chevy trucks. Same thing. I put a schrader valve in when the truck is behaving badly.
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Old August 20th, 2011, 11:20 PM
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Suspect a bad pump? or a bad regulator? The adapter fitting will only check the pump but doesn't check the regulator.

Good news is that you can do an easy go/no-go test on the regulator just by squeezing a pair of pliers down on the fuel return line at the rail. If the pump is working well, you'll also hear a change in the noise it makes.... a deeper sound as it works harder to fight the extra pressure. Just don't do it for long though, or you risk burning up the pump. A few seconds is all you need anyway.

-Hans
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  #6  
Old August 21st, 2011, 06:50 AM
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I made an adapter by cutting the appropriate bits of a set of old fuel lines and installing them with a gauge just before the fuel rail. One of the tools that never seems to get put away.
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Old August 21st, 2011, 11:38 AM
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Quote:
Originally Posted by junkyddog11 View Post
I made an adapter by cutting the appropriate bits of a set of old fuel lines and installing them with a gauge just before the fuel rail. One of the tools that never seems to get put away.
I have a length of hose I made like this as well. Made it into a long loop to help with securing the guage and its hose more easily. To spin the couple tight.

When I was at the Jaguar dealership we had a fitting that fit inline for the same style of fittings It was very short and easy to fit. Used it on many RRC's as well. Could never find a part number for just the fitting to order one. And it was invaluable for working on the older model Jaguars. Came in a factory fuel service kit. Had a kwick coupler to the guage and its hose as well. Nice arrangement. Wish someone would reproduce it.

This method, hose before the rail, and the fuel filter replacement style check the fuel regulator. You can apply vacum to the regulator and check its functions with or without vacum. Pinching the hose after the regulator is really only a test for over all fuel pump pressure. It helps to find a weak pump that may barely make the pressures unless a larger demand is put on it. Should be able to do this and watch the guage try to creep towards 100psi. Only do this briefly as it can damage the pump. It is also a good way to help flush the one way valve on a fuel pump that is sticking and letting line pressure drop when the pump is inactive.

------ Follow up post added August 21st, 2011 10:38 AM ------

Quote:
Originally Posted by Hans View Post
Suspect a bad pump? or a bad regulator? The adapter fitting will only check the pump but doesn't check the regulator.

Good news is that you can do an easy go/no-go test on the regulator just by squeezing a pair of pliers down on the fuel return line at the rail. If the pump is working well, you'll also hear a change in the noise it makes.... a deeper sound as it works harder to fight the extra pressure. Just don't do it for long though, or you risk burning up the pump. A few seconds is all you need anyway.
-----------
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  #8  
Old August 21st, 2011, 12:05 PM
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Something like this; http://jaguar.spx.com/detail.aspx?id=876
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Old August 21st, 2011, 01:30 PM
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Yeah that is it. How about that. Connector looks different in the description, but the short style inline is right. To bad the price is so high.

This is how I update the problem childs.
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Old August 21st, 2011, 01:33 PM
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Guage will come right into the passenger seat for a tet drive this way. And the risk of fire from leaking fuel is minimized with my homebrew schrader connection.
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  #11  
Old August 28th, 2011, 11:57 AM
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Thanks for the input guys. I broke down and purchased the OTC 7665 fuel filter adaptor which worked well. It allowed me to easily run the gauge to the passengers seat. The cheapest place I found one was online for $33.95. I however spent 50 and purchased it from O'Reilly's so I could have it quickly and didn't have to pay shipping which wound up only costing about an extra 5 bucks. I think the new ones are aluminum, mine must have been on the shelf for a while as it is the older machined brass style which I like better.

So with the gauge hooked up Im reading between 29 and 39 psi depending on the amount of vacuum the engine supplies to the regulator. It looks like the pump and regulator are functioning correctly. What do you think?

https://picasaweb.google.com/1161852...44464160882050
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  #12  
Old August 29th, 2011, 08:40 AM
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Do you think you could leave this installed permanently ?

If so, this could be a useful thing to have to test in the field !
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Old August 29th, 2011, 08:48 AM
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No because it replaces the fuel filter. Pendy has a valve installed just in front of the filter see (above ^^^) which is a good solution if you want something permanent. Or you could replace the fuel rail with one from a disco which has a schrader valve in it.
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Old August 29th, 2011, 08:55 AM
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Yes, I was thinking of something like what Pendy has done. Could I leave than in permanently ?
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Old August 29th, 2011, 08:58 AM
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Yes I believe that is what he has done...
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Old August 29th, 2011, 10:04 AM
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I made an adaptor from the fuel line of a RRC parts cat with a schraeder valve for the quick connect on the Snap -on gauge set. Goes in line at the back of the engine on the pressure side. Invaluable test rig IMO.
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Old August 29th, 2011, 10:42 AM
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Sounds like I must have this !
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  #18  
Old August 29th, 2011, 12:01 PM
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Quote:
Originally Posted by Roverlab View Post
I made an adaptor from the fuel line of a RRC parts cat with a schraeder valve for the quick connect on the Snap -on gauge set. Goes in line at the back of the engine on the pressure side. Invaluable test rig IMO.
Trevor got a pic?
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Old January 14th, 2014, 07:21 PM
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So without a schrader valve, is fuel pressure only able to be checked on the line near the fuel filter and not on the fuel rail itself? How can I confirm a bad regulator? Lightly crimped the line at the fuel rail to ensure the fuel wasn't just going straight back to the tank. Is this the only method?
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Old January 14th, 2014, 07:37 PM
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Quote:
Originally Posted by rijosho View Post
So without a schrader valve, is fuel pressure only able to be checked on the line near the fuel filter and not on the fuel rail itself? How can I confirm a bad regulator? Lightly crimped the line at the fuel rail to ensure the fuel wasn't just going straight back to the tank. Is this the only method?
Correct, need to remove filter & install adapter similar to the above (have one if you need it). Then you tap a gauge to it, using one that's long enough to reach into the psgr seat (if you need to test while driving).

What are your symptoms?
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