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Author Topic:   Mallory #4309 fuel pressure regulator
mustang68mustangs
Gearhead

Posts: 332
From: pittsburgh,pa.usa
Registered: Jul 2001

posted 07-14-2002 10:14 AM     Click Here to See the Profile for mustang68mustangs   Click Here to Email mustang68mustangs     Edit/Delete Message   Reply w/Quote

First I'll give you guys some backround of what I have and what I'm trying to do.
I have a Mallory Comp 250 electric fuel pump with all #8 an line throughout the car but I am using a deadead regulator and my fuel pressure goes all over the place .Soooo I wanted to get a return style reg. and run a return line and block off the pumps internal bypass.I was looking at buying the Mallory 4309 bypass or return style reg. for $75.00. Well I went to Norwalk yesterday and found one at the swap meet new for $20 so I bought it.
Now how do I hook it up I dont have directions for it.I have my feed line from my tank and one outlet going to my carb.The regulator has a port on the bottom that has a sticker on it that says bypass but looking in that hole it seems to have a plunger in it.Has anyone used this regulator or have one now that can help me?
If It comes down to it I guess I can order a new one and get the directions and then send it back.
Bob

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n2oMike
Gearhead

Posts: 1805
From: Spencer, WV
Registered: Jan 2001

posted 07-14-2002 11:17 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
That Mallory 250 is one FIREHOSE of a fuel pump.

That pump does not really need a bypass regulator since it has its own bypass on the bottom of the pump housing. That port on it's underside is meant to route fuel back to the tank. If plugged, you will NOT be able to control the pump. Make sure that return line coming from the bottom of the pump is plenty free and not restricted. Pump outlet pressure can be adjusted with the allen screw/locknut assembly on the front of the pump housing. It should probably be set to around 14psi or so if the car leaves fairly hard. A 'deadhead' regulator upstream should be sufficient for regulating it down from there.

As for the #4309 regulator, it's inlet is on the bottom, and any of the four upper ports can be used as the return. The other three are free to run fuel lines from. (I've got two on my car, along with two Mallory 140 pumps... carb and nitrous)

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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mustang68mustangs
Gearhead

Posts: 332
From: pittsburgh,pa.usa
Registered: Jul 2001

posted 07-14-2002 11:32 AM     Click Here to See the Profile for mustang68mustangs   Click Here to Email mustang68mustangs     Edit/Delete Message   Reply w/Quote
Mike, First of all thanks alot!!
You are a wealth of info.If you go to
WWW.CENTURYPERFORMANCE.com and read the tech articles about the pumps and regulators they say really good things about using a return line and regulator.
One more question, what is the little vacuum port looking thing on the reg. it has a little brass fitting .
Thanks again Mike!
Bob

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n2oMike
Gearhead

Posts: 1805
From: Spencer, WV
Registered: Jan 2001

posted 07-14-2002 11:48 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
The little brass fitting is a 'boost reference'. Unless you're running a blower of some sort, you don't have to worry about it.

Return style regulators are a great thing... They allow the pumps to run consistently circulate fuel and run cooler. The pump doesn't just pump 'up against a brick wall' at full pressure. Mallory felt it was important enough to include IN THE DESIGN of your pump. The 250 has it included in the pump housing. I guess you could run the #4309 return style regulator with your pump, but it's not necessary.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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mustang68mustangs
Gearhead

Posts: 332
From: pittsburgh,pa.usa
Registered: Jul 2001

posted 07-16-2002 08:59 PM     Click Here to See the Profile for mustang68mustangs   Click Here to Email mustang68mustangs     Edit/Delete Message   Reply w/Quote
Thanks Mike,
So I guess I can just cap off the vacuum port huh?
Bob

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n2oMike
Gearhead

Posts: 1805
From: Spencer, WV
Registered: Jan 2001

posted 07-16-2002 11:26 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
That, or just leave it be. It doesn't need a cap. Matter of fact, mine was in the way of something so I just sawed it off.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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