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  #1   IP: 12.47.208.34
Old 07-13-2010, 12:36 PM
tenders tenders is offline
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0-5 psi fuel pressure gauge

Very difficult to find but very useful to diagnose potential fuel delivery issues.

Stock fuel pressure gauges go up to 15psi but the Facet pump only delivers about 10% of that -- barely enough to move the needle.

I wouldn't put one on my instrument cluster but I would screw it directly onto the engine. If I suspect problems that this will troubleshoot I'm going to have to have my face jammed up against the carb in the cave anyway.
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  #2   IP: 71.118.13.238
Old 07-13-2010, 12:48 PM
Dave Neptune Dave Neptune is offline
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Thumbs up Yep

tenders, I have mine mounted next to the engine with a shut off valve on it tah feeds directly to the carb. All we have to do is look and know if the fuel pump is working correctly, no bleeping around and guessing!

Dave Neptune
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  #3   IP: 12.47.208.34
Old 07-13-2010, 01:05 PM
tenders tenders is offline
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Where did you find one with a range that's useful for A4 fuel pressures?
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  #4   IP: 206.125.176.3
Old 07-13-2010, 01:12 PM
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tenders...google is your friend.

I did a search on "5psi fuel pressure gauge" and found one thru the RX7 club.

http://mrcmfg.com/catalog/product_in...be8ffbe26b8a74
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  #5   IP: 12.47.208.34
Old 07-13-2010, 01:36 PM
tenders tenders is offline
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Oh, Google and I go way back. I own a couple of Mazdas too, but not an RX7.

You googled for a 5psi gauge but that is a 10psi gauge.

http://tinyurl.com/22tmzur

Don't know that I'd spend >$50 for a gauge that doesn't fit the bill much better than the readily-available 15psi model for half as much dinero (or less). I would drop that much if Don sold a 0-5psi gauge.

Last edited by tenders; 07-13-2010 at 01:43 PM.
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  #6   IP: 206.125.176.3
Old 07-13-2010, 01:47 PM
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gotcha tenders, no worries...You are correct that was a 10 psi gauge. - I like your "let me google that for you" - I'd never seen that before - lol!

I like that one posted in the other thread that is liquid filled.
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  #7   IP: 208.71.0.56
Old 07-13-2010, 05:00 PM
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Fuel Guage

I recently installed this one (see image) on my engine between the pump and carb. I have an extension tube off the T-fitting that goes about 12" vertical.

This allows me to watch the guage from the helm by looking down at my cockpit deck hatch (open) directly at the guage sticking up on the side of the engine.

Sweet!!!

(inexpensive on Amazon.com)
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  #8   IP: 206.205.188.247
Old 07-13-2010, 05:21 PM
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Here's my latest setup...
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  #9   IP: 75.36.151.182
Old 07-13-2010, 08:14 PM
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Before or After

Wouldn't it be best to install the gauge after the polishing filter?

If the polishing filter is clogged and restricting flow...
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  #10   IP: 206.205.188.247
Old 07-13-2010, 08:38 PM
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Quote:
Originally Posted by rpowers View Post
Wouldn't it be best to install the gauge after the polishing filter?

If the polishing filter is clogged and restricting flow...
Yes, in theory, then you are sure you're getting pressure to the carb.
Currently, however, I'm trying to diagnose my fuel pump heating up, (arrgh!) so I've got it right after the pump to keep an eye on it's "direct" pressure.

Good eyes though...
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  #11   IP: 71.130.128.10
Old 07-13-2010, 09:55 PM
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"Nostalgia time"

Dave Neptune,
I actually took a ride in a factory, Mazda powered boat at lake Naciamento in the late 70's. It felt like an outboard but there was no "thing" hanging off the transom. Most of us were running V8's at the time so it sounded wierd to us.
Tom
P.S. How did the July 4th regatta turn out?
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  #12   IP: 75.36.151.182
Old 07-13-2010, 10:07 PM
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Fuel Pump Re-circ Question

While we're on the topic of the Facet fuel pump:

What does the pump do when the float reservoir is full and the float valve is closed?

It seems to keep on humming (pumping), but does it recirculate fuel within itself? I've opened mine up to look at the mesh screen filter, and there is a ball-valve in the center. Does anyone know what goes on inside?

Also, what is actually doing the pumping.

Is it a membrane or some other mechanism?
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Old 07-14-2010, 05:21 AM
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Quote:
Originally Posted by rpowers View Post
While we're on the topic of the Facet fuel pump:
What does the pump do when the float reservoir is full and the float valve is closed?
It seems to keep on humming (pumping), but does it recirculate fuel within itself? I've opened mine up to look at the mesh screen filter, and there is a ball-valve in the center. Does anyone know what goes on inside?
Also, what is actually doing the pumping.
Is it a membrane or some other mechanism?
My notes scavenged last year from various archived posts (I did not track the sources):

"FACET fuel pumps have a small diaphragm which moves the fuel under pressure. The pressure is internally regulated by a small spring-loaded by-pass valve that has been preset for the rated pressure of the pump. It is normal for the pump to keep on pumping (making a clicking sound) even when the carburetor is full and the pump is operating against a dead-head, or zero flow, condition." (Don)

"Facet pumps click when running. Fuel flow is regulated internally by a spring-loaded bypass valve, so that the fuel is recirculated internally when the pump's pressure set point is reached. They push not pull"

Some Facet pumps have a check valve that prevents fuel from draining through the pump if the pump is off and there is a downstream carb leak. but I don't think the usual model used in A4s has that feature?
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  #14   IP: 206.205.188.247
Old 07-14-2010, 07:20 AM
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Quote:
Originally Posted by rigspelt View Post
Some Facet pumps have a check valve that prevents fuel from draining through the pump if the pump is off and there is a downstream carb leak. but I don't think the usual model used in A4s has that feature?
According to the Purolator (Facet) specs on their site, there is no check valve.
http://www.facet-purolator.com/index...d=14&Itemid=36
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Old 09-08-2015, 08:17 PM
hanleyclifford hanleyclifford is offline
 
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It is certainly no secret that low pressure gauges are readily available from a number of sources. But if this item were carried in the Moyer catalogue in the same section as the Racor filter there would be incentive to order one as part of a larger order rather than reading about it's purpose and value on the Forum, and then ordering it separately (and paying additional freight charges). Have we not seen thread after thread where this tool is valuable in diagnosis?
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  #16   IP: 137.200.32.38
Old 09-09-2015, 11:03 AM
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Moyer should get these and sell them:
http://www.chiefaircraft.com/aircraf...-cafpc-01.html

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  #17   IP: 107.0.6.242
Old 09-09-2015, 01:19 PM
hanleyclifford hanleyclifford is offline
 
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Quote:
Originally Posted by joe_db View Post
Moyer should get these and sell them:
http://www.chiefaircraft.com/aircraf...-cafpc-01.html

By the time you got the transducer and sender the price would be too high for our application. How about something in this price range: http://www.summitracing.com/parts/ea...FYMYHwodKXIKWA Of course a snubber would be required.
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  #18   IP: 137.200.32.38
Old 09-09-2015, 01:54 PM
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I like the idea of an electrical gauge that doesn't require running fuel lines to the panel. I have a $12 FleaBay pressure gauge that works great, but I have to open the engine room hatch to see it.
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  #19   IP: 107.0.6.242
Old 09-09-2015, 02:09 PM
hanleyclifford hanleyclifford is offline
 
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Quote:
Originally Posted by joe_db View Post
I like the idea of an electrical gauge that doesn't require running fuel lines to the panel. I have a $12 FleaBay pressure gauge that works great, but I have to open the engine room hatch to see it.
I do understand the inconvenience of direct read but for us the gauge is mainly for diagnostic and troubleshooting purposes, and adjustment for those of us with return lines.

Only pilots need to stare at fuel pressure gauges.
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Old 09-10-2015, 09:39 AM
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Plastic not USCG compliant

Quote:
Originally Posted by rpowers View Post
I recently installed this one (see image) on my engine between the pump and carb. I have an extension tube off the T-fitting that goes about 12" vertical.

This allows me to watch the guage from the helm by looking down at my cockpit deck hatch (open) directly at the guage sticking up on the side of the engine.

Sweet!!!

(inexpensive on Amazon.com)

Dear Rpowers

I did have a similar gauge but my learned colleagues on this site warned me that plastic in not USCG compliant. I now operate full brass.
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  #21   IP: 107.0.6.242
Old 09-10-2015, 10:06 AM
hanleyclifford hanleyclifford is offline
 
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Quote:
Originally Posted by Whippet View Post
Dear Rpowers

I did have a similar gauge but my learned colleagues on this site warned me that plastic in not USCG compliant. I now operate full brass.
I hope my plastic fuel tank is copastetic.
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