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  #1   IP: 70.49.71.208
Old 07-12-2012, 08:03 AM
Sony2000 Sony2000 is offline
 
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Gas pump(s) and PSI

The old setup had an electric gas pump (Brand X) with 4-6 psi. near the gas tank that is above the level of the carburator. So I installed a Facet 2-4 psi just prior to the carb. Between the two pumps is 3 feet of gas line and a fuel/water separator. My intentions were to use the older, larger pump for priming, and backing up the Facet, if it failed. But as it turns out, the Facet can't supply the engine with enough gas. It starts to miss and loose cylinders. I'm now running both pumps and maybe I'll shut off the Facet. I assuming that once there is 5-6 psi in the system the Facet doesn't work any longer. Should I go to two Facets of 2-4 psi, two pumps of 4-6 psi to have a backup, or stay away from pumps with 4-6 psi?

Last edited by Sony2000; 07-12-2012 at 02:34 PM. Reason: (Brand X)
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  #2   IP: 206.125.176.5
Old 07-12-2012, 08:18 AM
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sastanley sastanley is offline
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I would eliminate the 4-6 psi pump from the system and then see if the smaller Facet can pull fuel..It may not be able to pull thru the other pump closer to the tank..
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-Shawn
"Twice Around" - '77 Catalina 30, #511 with original A-4, but she does have an MMI manifold.
Sailing the boat a bit has been fun!! I am tired of messing around with other spark plugs, so, she's running great this summer on good ol' stock Champion RJ8C's
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  #3   IP: 96.229.195.76
Old 07-12-2012, 08:30 AM
Dave Neptune Dave Neptune is offline
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Exclamation Preassure

Sony, I use the mech-pump and it runs at just around 3PSI +/-and I have no fuel delivery issues even at WOT. My tank sits at about the same level as the engine and half a tank fuel level is about even with the top of the engines head.
There is no need for that much FP in the Zenith carb until they are feeding far more HP than the A-4 will ever develope.
There are many FP regulators available and they are easy to install ahead of the polishing filter (with a preassure gage & shut off valve). If you are going to make any changes the preassure gage will eliminate a lot of fuss when smothings amiss as you can "see" the fuel preassure so you can eliminate that from the list of possibilities~much much easier for diagnosing.

Dave Neptune
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Old 07-12-2012, 09:55 AM
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roadnsky roadnsky is offline
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Sony-
I'm with Shawn and Dave on this.
Three feet of fuel line with the tank above the carb...
the Facet should easily move enough fuel for the carb.
In fact, some of us (I'm one) have discovered you can actually have other issues with the Facet having too much pressure for the carb.

This comment from Don:
"We are told by engineers from Zenith that the needle and seat of the float valve assembly is designed to satisfactorily regulate the level in the float chamber up to 4 PSI. We know from our own experience that fuel pump pressures in the range of 2 PSI can cause the engine to lose power. For this reason, we recommend a nominal fuel pump pressure of 3 PSI for most boats."

As Dave recommends, a fuel pressure gauge will tell you a lot about what's going on too.
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Old 07-12-2012, 10:49 AM
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sastanley sastanley is offline
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Jerry,

What fittings did you put on the back side of your Mr. Gasket gauge?? Is it just a "T" with two barbs & a short 1/8" nipple for the gauge?

When I get some 'play' time on the boat, the fuel pressure gauge is on my list.
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-Shawn
"Twice Around" - '77 Catalina 30, #511 with original A-4, but she does have an MMI manifold.
Sailing the boat a bit has been fun!! I am tired of messing around with other spark plugs, so, she's running great this summer on good ol' stock Champion RJ8C's
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  #6   IP: 184.6.139.91
Old 07-12-2012, 11:25 AM
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roadnsky roadnsky is offline
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Quote:
Originally Posted by sastanley View Post
What fittings did you put on the back side of your Mr. Gasket gauge?? Is it just a "T" with two barbs & a short 1/8" nipple for the gauge?
Sorry I took a while Shawn. Had to run down to the boat real quick.
There's a big storm on the way...

Anyway, it's sorta like you described.
It's a T with barbs and it's tapped for 1/8'".
The gauge has the 1/8" male on it already if I recall correctly.

Here's a couple of pics of the adapter.
(If you're at work and can't see, lemme know and I can email the info if you want)

All in all, it's a nice little set-up for our needs.
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  #7   IP: 199.173.224.31
Old 07-12-2012, 12:29 PM
joe_db joe_db is online now
 
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Some fuel pumps are designed to shut off the flow when not energized. You may have one of them.
Pressure and filter vacuum gauges shown. That way you'll know what is going on. The two pumps I have can work with either one on or both.
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Last edited by joe_db; 07-12-2012 at 12:49 PM.
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Old 07-12-2012, 01:11 PM
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sastanley sastanley is offline
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thanks Jerry..I recall that part now..just gotta get one!
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-Shawn
"Twice Around" - '77 Catalina 30, #511 with original A-4, but she does have an MMI manifold.
Sailing the boat a bit has been fun!! I am tired of messing around with other spark plugs, so, she's running great this summer on good ol' stock Champion RJ8C's
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  #9   IP: 184.6.139.91
Old 07-12-2012, 01:29 PM
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roadnsky roadnsky is offline
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Shawn-
Looks like Amazon has it for $12...

http://www.amazon.com/Mr-Gasket-2975...560+Fuel+Press...
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  #10   IP: 184.6.139.91
Old 07-12-2012, 01:35 PM
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roadnsky roadnsky is offline
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Quote:
Originally Posted by joe_db View Post
Pressure and filter vacuum gauges shown. That way you'll know what is going on...
I have the MMI Vacuum Gauge.
Works great!
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1978 RANGER 30 (#114)
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  #11   IP: 206.125.176.5
Old 07-13-2012, 07:40 AM
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sastanley sastanley is offline
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Quote:
Originally Posted by roadnsky View Post
Shawn-
Looks like Amazon has it for $12...
Sweet..added to my wish list towards my next $25 set of purchases.
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-Shawn
"Twice Around" - '77 Catalina 30, #511 with original A-4, but she does have an MMI manifold.
Sailing the boat a bit has been fun!! I am tired of messing around with other spark plugs, so, she's running great this summer on good ol' stock Champion RJ8C's
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