Mechanical Pump fuel Pressure ?

[Bruno2]

How many PSI does a factory 351W fuel pump pump make? I am wondering if I need to add a regulator to my set up for Jr? I will be running an Edelbrock carb and they like a lower amount of pressure than other carbs do.

I havent put much thought into it, but I am even wondering if a stock pump will supply enough fuel to keep the mild build fed?

Surely it will. The carb is a 650 CFM unit. The cam is pretty mild and the heads are comparable to factory GT 40's.

[Bruno2]

I was looking at this one:

https://www.ebay.com/itm/Carter-404-501HP-Fuel-Pressure-Regulator/172612219856?epid=227269341&hash=item28307d73d0:g:5PMAAOSwEK9W~r~i&vxp=mtr

I like edelbrock, but they are like 3X's this amount. I had a bad experience with Summit's house brand which was in fact a Holley.

[Gary Lewis]

I think a factor pump goes to maybe 7 psi, which is more than an Eddy likes, which is a max of 6 psi.  But, before you worry about that let me check the factory shop manual later this morning.

And, don't you have a fuel pressure regulator on the Bronco?

In any event, I'm pretty sure that a stock pump will feed that engine just fine.  The design for the pump is the same as for the 460.

[Gary Lewis]

Oh, so the Holley gave you problems?  I don't think I'd heard about that.

That Carter sure looks like the Holley.

[Bruno2]

The Bronco does have one and will need it to run ... eventually.

I bought a Holley pump and it wouldnt hardly make 2 PSI. I think that was the issue and not the regulator. So that post may be inaccurate.

[Gary Lewis]

I've not had trouble with the Holley regulator I have on Big Blue.  And, it was on Rusty before I sold him.  Seems to work fine.

You could put the regulator/gauge combo from the Bronco on this engine and at least see what pressure the pump puts out.  If you don't need it, take it off.  If you do, leave it on and buy another one when the Bronco "eventually" comes to life.

[reamer]

My NAPA mechanical fuel pump was pushing over 10psi to my Eddy 600cfm, making for hard "hot" starts.
Had to install a regulator (I set it to 7psi) worked great all last season, (even running past 85 mph, LOVE the overdrive ZF).......and fired up first try this season....

[Bruno2]

Here are some more that are cheaper:
https://www.amazon.com/Quick-Fuel-Technology-30-803-Regulator/dp/B003M8YJ1S/ref=sr_1_23?ie=UTF8&qid=1522785776&sr=8-23&keywords=Fuel+Pressure+regulator

https://www.summitracing.com/parts/tfs-25017/overview/

All of these say they have one inlet and two outlet ports, buy say "no" for a gauge port. Why cant I use an outlet for the gauge?

[Gary Lewis]

Brandon - The Quick Fuel regulator has to be the Holley one.  The pic below, of the Holley non-return style regulator that's on Big Blue is the spitting image for the Quick Fuel one.  Mine has "In" and an arrow in the two places that one does, and it says "OUT" on both ends with arrows there as well.

But the Trick Flow unit is slightly different.  The body is different and there are no arrows.

In any event, as you can see in my pic, I'm using a gauge on one "out" port and a hose to the carb on the other.  That regulator has performed perfectly for many thousands of miles that way, having first been on Dad's truck, then Rusty, and now Big Blue.  I've always had the gauge on it, and the pressure shows just fine.  In fact, as said, on Dad's engine or Rusty's with the mechanical pump it would sometimes still have pressure the next day.  But not so on Big Blue as the pump on it apparently doesn't have a check valve.

In any event, there is no reason you can't put a gauge on one end and the supply to the carb on the other.  It is straight through and whatever pressure you have on one end you'll have on the other.

[Bruno2]

This is on the Bronco:



There seems to be multiple units packaged by different "brands" of this same regulator.

This is the quick fuel:https://www.ebay.com/itm/192371142711

This is the Carter:https://www.ebay.com/itm/Carter-404-501HP-Fuel-Pressure-Regulator/172612219856?epid=227269341&hash=item28307d73d0:g:5PMAAOSwEK9W~r~i&vxp=mtr

This is the Holley:https://www.amazon.com/Holley-12-803-Fuel-Pressure-Regulator/dp/B00029JC6C/ref=sr_1_4?s=automotive&ie=UTF8&qid=1522794268&sr=1-4&keywords=Fuel+Pressure+regulator

Here is Summit's generic (which I was told by a salesman there it was indeed the Holley):https://www.summitracing.com/parts/sum-g3032/overview/

So, with that being said a guy can pay anywhere from $25-$75 for it depending who stuck their brand on it and who is selling it.

I have no doubt these are all the same unit probably manufactured in China and boxed by whomever.
There is an epidemic of this in the aftermarket for autoparts now. My neighbor Gil teaches automotive tech at the Vo Tech here. Is pretty savvy about stuff like this because he deals with all kinds of factory reps and dealerships. He told me if an AC compressor is a remand now it is rebuilt by one comapny in China for everybody rather it be Four Seasons , Cardone or whoever else has their hat in the ring. He advised to buy the absolute cheapest because their is no difference.


I ended up buying the Quick Fuel because I had bad luck with a Summit generic part once that was a rebranded Holley fuel pump and I am not a fan of Holley either.

I bought this little Fuel Lab guage to go with it:https://www.ebay.com/itm/Fuelab-71502-1-5-0-15-Psi-Carbureted-Fuel-Pressure-Gauge/391998845976?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

[Bruno2]

I was wanting Bill Vose to verify the out/out being fine for a gauge. However, it makes perfect sense what we discussed. This is the same principle that a tire gauge works off of.The pressure is equalized no matter what. The regulators that have two outlets and a gauge port are apparently for dual feed carbs because both outlets would be occupied so a third port would accommodate a gauge without Tomfoolery having to be added.