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-   -   0-5 psi fuel pressure gauge (https://www.moyermarineforum.com/forums/showthread.php?t=4292)

tenders 07-13-2010 12:36 PM

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.

Dave Neptune 07-13-2010 12:48 PM

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:cool:

tenders 07-13-2010 01:05 PM

Where did you find one with a range that's useful for A4 fuel pressures?

sastanley 07-13-2010 01:12 PM

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

tenders 07-13-2010 01:36 PM

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.

sastanley 07-13-2010 01:47 PM

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! :D

I like that one posted in the other thread that is liquid filled. :)

rpowers 07-13-2010 05:00 PM

Fuel Guage
 
1 Attachment(s)
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)

roadnsky 07-13-2010 05:21 PM

1 Attachment(s)
Here's my latest setup...:D

rpowers 07-13-2010 08:14 PM

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...

roadnsky 07-13-2010 08:38 PM

Quote:

Originally Posted by rpowers (Post 24094)
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!:mad:) so I've got it right after the pump to keep an eye on it's "direct" pressure.

Good eyes though...;)

thatch 07-13-2010 09:55 PM

"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?

rpowers 07-13-2010 10:07 PM

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?

rigspelt 07-14-2010 05:21 AM

Quote:

Originally Posted by rpowers (Post 24103)
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?

roadnsky 07-14-2010 07:20 AM

Quote:

Originally Posted by rigspelt (Post 24117)
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

hanleyclifford 09-08-2015 08:17 PM

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?

joe_db 09-09-2015 11:03 AM

Moyer should get these and sell them:
http://www.chiefaircraft.com/aircraf...-cafpc-01.html

http://media.chiefaircraft.com/media...S_CAFPC-01.jpg

hanleyclifford 09-09-2015 01:19 PM

Quote:

Originally Posted by joe_db (Post 94554)

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.

joe_db 09-09-2015 01:54 PM

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.

hanleyclifford 09-09-2015 02:09 PM

Quote:

Originally Posted by joe_db (Post 94561)
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.:):D

Whippet 09-10-2015 09:39 AM

Plastic not USCG compliant
 
Quote:

Originally Posted by rpowers (Post 24087)
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.

hanleyclifford 09-10-2015 10:06 AM

Quote:

Originally Posted by Whippet (Post 94576)
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.

campbdon 06-07-2021 05:18 PM

Hi sastanley, that link http://mrcmfg.com/catalog/product_in...be8ffbe26b8a74 goes someplace unexpected looks kind of dodgey to me . Do you know the make and model? I too would like to find a 5 or 10 psi gauge.
Thank You
DonC

Sam 06-07-2021 05:51 PM

i am happy with stainless steel, glass face and liquid filled 0-15psi "Marshal" brand from ebay, about $15 and $12 for the inline adaptor.

ronstory 06-07-2021 09:45 PM

I used a 'measureman' from amazon.

https://www.amazon.com/Measureman-Gl...3116582&sr=8-4

No issues, just works.

roadnsky 06-08-2021 10:32 AM

This is the one a lot of us use around here...

https://www.amazon.com/dp/B000BWCFLO...v_ov_lig_dp_it


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