Mallory 4150 Fuel pump opinions

[Chad Sheets]

http://www.summitracing.com/

 

[Chad Sheets]

http://www.jegs.com/

Here is Jegs site also if you want to look them up.

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Always ready to help!
2000 2500 Red Sport quad cab, 4x4, K&N, DDI's, straight piped, boost, pyro and fuel pressure gages, Hot Power Edge, EZ box, mean looking set of 33. 5" tires, Snap On diamond tool box, Marine Corps window sticker, Semper Fi!

1972 340 Cuda'. Original tripple Black, 340 car w/air. Good clean car, super stock springs, Weld Prostars, shaker hood, strong 340 with a 727/4000 stahl, 4. 56... . Bombs away!
NRA Life Member
My Diesel Page

 

[John]

Alan, the Mallory electric fuel pump I previously mentioned was not a direct replacement for the OE lift pump. What Mallory meant was, that particular pump will work in our application (i. e. , internally bypassed system) without major replumbing.

sport bike, according to Mallory their 4140 pump IS internally bypassed.

[This message has been edited by John (edited 02-01-2001). ]

 

[Chad Sheets]

Nah, that return line is for people running 7 psi or something like that. That way the extra fuel the pump has can be sent back to the tank and keep all the pressure down. If the pump is pumping out 15psi, and you only use 7 psi of it, then the pump works harder because it has a resistance of pressure it is pushing against. That's how I see it in my head at least. Will find out for sure when it gets here. Either way I think we can all put our heads together and come up with something. After all, you have to be part engineer to own one of these bombed rigs.

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Always ready to help!
2000 2500 Red Sport quad cab, 4x4, K&N, DDI's, straight piped, boost, pyro and fuel pressure gages, Hot Power Edge, EZ box, mean looking set of 33. 5" tires, Snap On diamond tool box, Marine Corps window sticker, Semper Fi!

1972 340 Cuda'. Original tripple Black, 340 car w/air. Good clean car, super stock springs, Weld Prostars, shaker hood, strong 340 with a 727/4000 stahl, 4. 56... . Bombs away!
NRA Life Member
My Diesel Page

 

[Mopar-muscle]

i just looked in my summit catolog and from the sounds of it , the BG pump will require a seperate return directly to the tank , i think plumbing it to the return line from the injection pump could cause a problem as the pressure from the BG pump may be higher than that coming from the injection pump , also its a -10an line connection .

i think there is an extra line that could be used , either than or add a bulkhead and a length on alum tube to direct the return into the bottom of the tank so as to have less chance of foaming ... i can see a long weekend with my tank on the floor when i do this new fuel pump ...

[This message has been edited by Mopar-muscle (edited 02-01-2001). ]

 

[Chad Sheets]

Got it in the mail today. They have me a little confused on the diagram. It shows the tank flowing to the pump. The pump to the carb, and then the carb flows excess to the regulator, which in turn puts it back in the tank. What kind of set up is this??

If the pump is flowing 15 psi to the carb you will blow past the needle/seat. And why a regulator after the carb?

I am getting some fittings Sat. to do the job with. Might upgrade the banjo fittings as well. Anyone have any tips or insight into how to do this?

 

[Bad340fish]

Thats the way alot of the big pumps ar routed. I guess one reason would be for quicker recovery from low pressure due to the carb feeding directly from the pump and the regulator dumping off any excess back to the tank. My buddy has a Nova that is plumbed with 5/8" line to the dominator and has a 3/8" return from there(hooked up like you said) and another 3/8" return to the tank(one bad*ss pump) But from what i understand on your ram you should be able to just run that pump straight and have no probs. Let us now how it turns out.

Clark

 

[Mopar-muscle]

chad , as i heard bombing the banjo fittings involves just drilling the holes in them larger , what you really need to do is get the adaptors and put swept 90's in their place .

 

[Chad Sheets]

Go on, I'm listening. Swept 90's? I have an idea, but not sure. Is it just a 90?

 

[1tuffram]

Not sure if this makes a difference or not, but are these pumps designed for diesel fuel use?

 

[Chad Sheets]

They are for street use on "hot rods". They can handle the harsher fuels and the mild fuels as well. The pumps our trucks have now were designed for diesel and you see what happened there. Something has to work. I think this is it.

 

[Bad340fish]

The Swept 90s are the AN fittings that have a small tube that makes a somewhat gradual bend as opposed to a sharp 90.

Clark

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Clark
1999 2500 QC SB 5spd Flowmaster 3 chamber
1968 Barracuda Formula S Viper Blue 11. 98@112

NHRA member for life

 

[Chad Sheets]

OK. I have seen them then. Are you talking about the ones that look like gradual 90's but are still banjo fittings?

 

[Bad340fish]

They have them in banjo pipe and flare fittings

You might like this website Aeroquip has a link on it. Very usefull site http://home. isoa.net/~mharrisj/race.html

Enjoy


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Clark
1999 2500 QC SB 5spd Flowmaster 3 chamber
1968 Barracuda Formula S Viper Blue 11. 98@112

NHRA member for life

 

[Chad Sheets]

I found the aeroquip site, but no more insight to this mission. I guess I will have to see what all Earls Fittings has.

I might get by with the stock 3/8 line anyway with that hog pump pushing 15 psi.

 

[sport bike]

Chad,

You have to run a return line and atleast -8 from the tank to the pump. You don,t want to starve the pump or create to much back pressure in the pump. I would set it up with -10 line to the pump and -8 from the pump to the injection pump. Use -8 as a return line. Then you will never worry about fuel starvation again.

I have been trying to answer some of your post for the last 3 days but some body had made it impossible for me to do it. TDR is not very good at answering peoples e-mails.

John/SP

 

[Chad Sheets]

You sound like a man of experiance. Care to educate me on the mechanics of this system and why you need a return line, or reguator?? I cant get it through my thick skull #ad


I have used several elec fuel pumps in the past, all holley red and blues, for my drag cars, and a few street cars. I must have that type system tatood into my mind frame because I cant see the reasoning behind the return line, or the rugulator at all? Its not that big of an issue to hook it up, I would just like to know why I am hooking it up.

Shed some light on this for us.

 

[Bad340fish]

-8 is a HUGE return line. Thats bigger line that a prostocker runs as a primary line. If your return is to large than it will be easier for the fuel to go back to the tank rather than into the injection pump and you will have fuel starvation. If the stock return is regulated at 14psi then i would say that pump can run wide open with no probs at all. If you have a guage you can monitor this very easily. See ya
Clark

 

[sport bike]

You don,t need a regulator. That is for people running carbs. They only need it to keep from over powering the float needle. You usually set up the regulator at 7psi for carbs.

Prostockers run -10 all the way to the regulator. -8 as a return line.

The smallest line that you want to run from the tank to the pump is -8. Even though -8 is equal to 1/2", the fitting sizes are . 360 of an inch. That is why -10 would be better.

You need the return line to keep from getting to much back pressure in the pump. The pumps bypass pressure is set at 15psi. Once it hits that pressure all the unused fuel is then returned to the tank. With a pump flowing 220gph,there is alot of fuel that needs to be returned to the tank. At idle,about 90% of the fuel will be returned. As loads increase and decrease so will the amount of fuel that is returned threw the bypass. This will always keep the line pressure at 15psi going to the injection pump. But if you don,t increase the supply lines to the injection pump. Pressure will fall as it passes threw different restrictions on the way to the pump. I would recommend -8 fittings to the injection pump. Drill and tap the filter housing to 3/8npt for your -8 fittings. Buy a parker 12mm male to 1/4npt female fitting. Drill it out to . 306(5/16th drill bit)Use a parker -8 to 1/4npt fitting to hook up the -8 line to the injection pump. (drill that fitting with the same drill bit)Then you will never worry about fuel starvation again!

John/SP

 

[Chad Sheets]

But this return port they tell me to run comes out of the regulator, thats why I am scratching my head here about a regulator and return line. The fuel pump only has 2 ports, fuel in and fuel out. No return ports or anything?? If I am going to run the return line I have use this regulator they sent with it.

[This message has been edited by Chad Sheets (edited 02-03-2001). ]