How much PSI requried for dual carbs?

[Raidmagic]

Hey Grumpy, I'm building my T-bucket with my old Vette motor and I've put a tunnel ram on it with 2 Holley 390's, how much fuel pressure is needed for these two carbs? Question 2 does my stock 87 cam have the lobe on it to run the mech. fuel pump? I've got that installed but am not seeing any fuel pressure so I'm concerned that the fuel injection cams don't have this. Thanks

 

[grumpyvette]

some but not all efi cams came with the fuel pump cam lobe, that is obviously required to run a mechanical fuel pump,
obviously , that can be verified by temporarily removing the fuel pump and holding the fuel push rod in against the cam lobe with your finger while your manually spinning the crank with a ratchet on the damper bolt , that will quickly let you know if swapping to an electric fuel pump rather than a manual pump is in your immediate future.
if the push-rod won,t cycle you've got a problem, running a manual fuel pump

http://web.archive.org/web/200701062316 ... 1.htm#FPHP

can you post pictures of that car and engine?

you might also have a bolt that's too long in this hole restricting the push-rod movement, in the hole indicated in the picture below

Almost all carbs work best with a fuel pressure in the 4.5psi--5.5 psi range

read these and there sub linked info

viewtopic.php?f=55&t=2994

viewtopic.php?f=55&t=211

viewtopic.php?f=55&t=635

 

[Raidmagic]

Here is the car, it's a work in progress, I've swapped in the Vette motor with the tunnel ram, added 4" to the bottom of the body, lowered the seats, redone the frame and added the bed with new tank. Still need to get a drive shaft made and redo the front suspension but it's coming along

There is no bolt in the hole you pointed out.

Here are the carbs.

 

[grumpyvette]

on a few blocks that boss did not get drilled or threaded but you can clearly see the boss behind the radiator hose and below the freeze plug, in this picture, if you remove the pump and verify the fuel pump push rod is cycling in and out as you manually rotate the engine, with the fuel pump push rod on the cam lobe then you've obviously got a fuel line or pump issue.

btw
From experience I can tell you, those cars are A LOT of fun to drive and easy to work on making them a fun toy,
if youve ever wanted a fast car, a properly built T-bucket can sure satisfy your desire to scare yourself silly
THAT car brings back MANY memories as several of my friends used to own,or still do own similar cars,
one in particular with a stroker 440 mopar, torque-flight trans and a dana 60 rear still makes me twitch, remembering how fast it was and how close it came at times to getting us killed before we fully understood that fully functional brakes and suspension were also mandatory features
the problem is that you can,t leave them un-watched for long before some total ass starts screwing up your car, its like theres a 6 foot tall blinking neon sign only total jerks can see that says
SCREW WITH THIS CAR,!, STEAL PARTS!, IF FOUND UN-ATTENDED!!!