ok i got the new fuel pump an reg the pump is a walbro 255lph pump but i caint get the regulator to work right it has a return line on it but where it bolts together there is a gas kit an it doint let any fule through to the return an when i try to open the regulator to let fuel through it gives way to much have any of u guys used this fuel pump here a pic of it

 

https://www.rx7club.com/picture.php?albumid=3426&pictureid=28806[/IMG]

 

 

 

c where it bolts together there is a gaskit n there but the return line is on top n gas can get there

 

On the top...? Uh... are you sure that's the return and not a boost reference port? What fuel pressure regulator is that, anyway?

 

its one from r1spec it says its a universal fuel pressure regulator with adjustable psi gauge from 0 to 140 psi

 

Post the link to where its sold online so we can see the specs.

 

go to ebay type in fuel pressure regulator it will show tons of them

 

[URL="http://cgi.ebay.com/ebaymotors/UNIVERSAL-FUEL-PRESSURE-REGULATOR-ADJUSTABLE-PSI-GAUGE-_W0QQcmdZViewItemQQhashZitem2a0a021818QQitemZ18055 6535832QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccesso ries"]

 

*Sigh*

That setup you just bought will NOT work. Not only is that fuel pressure regulator intended for fuel injection (wrong adjustment range), it's also not return style. Meaning you will never be able to regulate the Walbro 255 (a fuel injection pump) down to 3-4 PSI.

 

dam!!!!! so what do i need the pump will work right

 

hey the regulator says for all apps

 

"All fuel injection applications" I could believe, but it's impossible to build a non-bypass regulator that will work equally well at 3 PSI and 100 PSI. Notice how the fuel pressure gauge shows EFI fuel pressure ranges?

You have two options.

Buy one of these and use the Mr. Gasket fuel pump:
http://www.summitracing.com/parts/HLY-12-804/

Buy one of these and keep the Walbro:
http://www.summitracing.com/parts/MAA-4309/

Now, the second setup would be better, and similar to mine, but you might need to run a bigger return line to get it to regulate properly, I'm not sure. I'm running a 5/16" return line and my fuel pressure is stable.

Or you could get one of these fuel pumps and either one of the above regulators and not worry about it:
http://www.summitracing.com/parts/CRT-P4070/

 

what r u running

 

I'm using an MSD EFI pump with a Mallory 4309 regulator and a GSL-SE stock (5/16") return line. I have to run a setup like this since I'm boosted, but you could just as easily use a carb fuel pump and a carb-style non-return pressure regulator like the Holley unit I linked to above. But if you want to use an EFI fuel pump like your Walbro 255, you have to use a return-style regulator.

 

what u mean boosted, turbo or nos

 

an thought u had to have 190lph to run this carb

 

Turbo.

30 GPH (114 LPH) is more than any stock or streetported NA 12A will ever be able to use. Realistically, you'll probably only need more like 20 GPH. You just have to make sure that the fuel pump can deliver that much at 3.5 PSI or whatever fuel pressure you decide to run, at the voltage of your electrical system, taking restrictions in the fuel system and things like that into account.

 

well the stock pump puts out 25gph ok so i didnt need a new pump but wait u said that it had to do it at 3psi i know the stock pump can do it just not under a load an i doint think the mr.gaskit pump i have can eather, but i have a carter pump but i doint know what it puts out as far as psi an gph/lpg

 

an that regulator that u showed me do i have to buy the fittings to it

 

http://www.summitracing.com/parts/CRT-P60504/?rtype=10 here we go found the carter pump that i have

 

The Mr. Gasket pump is borderline. You might be okay with it, but you might starve for fuel during long WOT runs. Dunno about that Carter pump. Doesn't list any specs other than saying it puts out 4 PSI. You could always try it unregulated; just keep an eye on the pressure.

Both of the regulators I linked to do not come with fittings.

 

That carter is an OEM replacement, don't waste your money. It won't supply
enough flow for your weber. Even though its a 45 DCOE, I'm pretty sure it will
only work at WOT for a limited time with that pump.

Get a Carter 4070 and a Holley regulator either dead head or return style and
you would be set for any carb you would have.

 

yea i have the carter are ready just never new what it p put pushed have had it for awile i put it on to day it works better than anything i have tryed so far no regulator on it just a inline fuel gauge says 3psi an a good 2.5 when i rev it up but i have some more fuel line i think i am going to add in so i can make it where i can see the gauge so when i drive down the road i can see what is says.