I just tried to start my engine and i have got no fuel pressure at all.I have twin 650 holley,s a 170 GPH holley mechanical pump and
an earls inline fuel filter on the feed line before the pump.
I still have the standard TPI fuel filter under the car(new) and the
original hard lines coming from the tank all the way to the TPI rubber hoses and then it's all braided.
Stupid question but?Feed line goes into the inlet on fuelpump then exit's the outlet of the pump up into the regulator then into the carbs right, and return line from regulator running back into hard lines.Could i need an electric pump to help the mechanical
one on the block?.
Anyway thanks in advance.
This is realy starting to bug me it's been of the road for 2 years now.



Jeff.

 

What kind of regulator are you running?

 

What have you done to the pick up in the tank? Is there any fuel in the lines at all? My gut thinks its in the pickup, in the tank. Everything else you have stated sounds legit.

 

Five7 I have a mallory 4309 with return line.
I took out the in tank pump and run a bit of fuel line the same lenght as the pump was (maybe should have brazed a bit of tubing there instead) also there is no fuel in the lines at all.
I might have to take out the tank again and check that nothing is blocked.any help at all would be appreciated.
Thanks


Jeff.

 

before you pull the tank, try to use the feed line to siphon fuel out. That way you can test the pickup without pulling the tank. It could be as simple as having the feed and pickup swithched.

BTW, you may want to think about running -8 to the regulator and getting rid of all the factory 3/8" stuff.

 

Is there a siphoner i can buy or is there an easier way of doing it that i can't think of.
Thanks for the help.


Jeff.

 

Pull the line off and suck on it. Hopefully you dont get amouth full. Seriously though, just be careful.

 

Two years, and it's just starting to bug you 'now'? My goodness...

Mechanical pump? If you're running a mechanical pump, they why would you be using the Mallory 4309 afpr along with it? Remove that adjustable regulator, and that filter before you're pump, and run you're feed line directly to the mechanical pump. You don't even need you're return line to be functional (which I believe to be the culprit here), as you're lucky to be pulling 10psi....

Make sure you're gas cap is on, too.

 

Holley say a fuel pressure regulator is required or are they just trying to get you to buy there regulator.i hope i can take it out the less amount of parts used the better.If i don't use the return line what do i do with it just cap it or leave it alone.Is there any way fuel can come back out the return line.

Thanks for the help.

Jeff.

 

Just cap it off with a rubber plug, and place a small clamp on it....

As for the regulator, do you have it before, or after, the fuel pump? If it's before it, then there's you're reason why you're not getting any fuel....

I wouldn't even bother putting it on, as you're running two carbs, right? Just run you're pump feed line (from the pump) straight to the carbs.

 

I'll cap the return line and remove the regulator and see what happens hopefully it will get fuel.I can't do it till the weekend but.
I have The regulator is after the pump.

Thanks again.


Jeff

 

Hey street lethal why do you think it could be the return line.What effect would it have and is it because i don't have a high pressure pump.

thanks.


Jeff.

 

Hey Jeff. If you're positive that you're using the right feed line to the mechanical pump (the biggest of the two fuel lines, and by the way, the third line is still plumbed into the vapor canister, right?), and if you attatched you're fuel hose exactly where you're intake pump (inside the tank) used to be, and if you plug you're return line, and made sure you're gas cap is on (eliminating any forms of vacuum loss), then you're engine should fire right up.

It's also possible that you might have you're 4309 hooked up wrong. Try removing the 4309, and run you're fuel directly to the carbs. If everything else (the above) is good, the engine should fire right up. You could use the regulator if you really wanted to, but, the mechanical pump works hard 'sucking' the fuel from the tank (and the pressure isn't that great, in comparison to the TPI's electric pump)... and IMHO, doesn't really need to be regulated.

Toss the regulator for now, give the engine some time to alow the pump to suck some fuel from the tank (spray a little bit of carb cleaner down into the carbs), and when she finally catches.... umm, I believe you already know what will be the next step.

Have a great Thanksgiving!

 

I removed the regulator and disconnected the return line today hooked the line back up but it got to late to try and fire it up. I will try to fire it up on saturday.
And again thanks for the help much appreciated.


Jeff.

 

It started.
I took the regulator off,diconnected the return line and sucked on the end of the fuel line to get fuel to the pump.I crankend it and it started doing little backfires through the carbs so i checked the dizzy and it was 180 degrees out so i changed it and it fired straight up.I had No mufflers on so i could'nt run it for long but it sounded awesome.

Thank's to everybody that helped me out cheers.


Jeff.

 

You honestly didn't have to suck on the fuel line, as the mechanical pump would have had the fuel to the carbs within a matter of seconds....

Either way, I'm glad you discarded that regulator. Now go enjoy that car of your's....