willeys i plugged fuel line off front to back pumped 12 psi air into line used soap on line no bubbles also used vaccum pump to pump line down vaccum it held that over night shine the cross over for manifold was plugged from the factor all blocked off shine have 1 1/2 psi

willeys33 i used 12 psi air in line front to back wet down with soap water no bubbles at all used vaccum pump next pumped it down it held pressue all night long and no i havent used gas can as fuel supply yet im in the process of putting the mechanical pump back on im going to run both i like the fact of it starting right up when it sits a few days some reason edelbrocks loose there prime when they sit a few days ill let you know how i make out bob in ny

Bob, if it didn't stall at the low pressure, I would lean more towards fuel volume.

Does the truck run out fine at higher rpms? Does it drop off as if its running out of gas?

I'm not as concerned with the pressure, because we aren't talking F.I. that needs a certain amount to force the fuel through the injectors at a rate of psi and gallons per hour.

A carburator runs off of vacuum. Using pressure to get the fuel to it and keep the bowls full. You cant get fuel in without some pressure from the pump. If the pump was pumping 1 or 2 psi and still able to flow enough fuel to keep the bowls full, all would be well.

What size is the fuel line?

72 cheyanne the trouble is when the psi drops down at idle for about 15 minutes on a hot day it was stalling out with the psi going down to 1 1/2 then you could watch it drop do to 0 psi then stall now its cooler last few days it hasnt stalled it stills drops down to 0 psi then it will recover back to 1 1/2 psi mind you its cooler up here driveing down the road it runs like a cat up on a hot tin roof when i throttle it with hood open to be able to see pressure gauge it will go up to 2 psi the problem is at long idle time on hotter days thats going to be most of the summer in ny im going to try putting hose directly into fuel can from suction side just to eliminate the fuel line from front to rear if still does it then ill hard line it right from pump to carb other then a new piece of injector hose 3 inch long going into carb if still does it ill use another friends carb to see if any changes there it makes sense that it has to be before the electric pump 3 ft from tank you would think a pressureized fuel line would not drop the pressure like this thanks for your help bob in getting warmer ny ive been embarrassed before for eng failer i just dont want it to happen every week end thanks again

Regarding the fuel pressure drop problem, if you have not already, you might consider replacing your fuel regulator with one that stops pressure drops. They're primarily designed for racing but may work with your application. They have units that work with both carb and efi for engines up to 2000 hp. Made by Magnafuel, they are not cheap; run about $135 for a 2 port unit. Might help to eliminate the pressure dropping.

Or you could just leave the hood off. Some engines just need to be seen!

Smooth surface will not transfer heat to air as well as rough surface or finned surface.

The air moving over the engine if it is cooler than the surface temp of the engine, will take the heat from the surface as it passes over. If it is as warm or warmer it will not. The rough surface with will slow the air down and cause it to take the heat through radiaton transfer. Finned surfaces will channel the air and will transfer heat better through more contact. The smooth surface will allow the air to move without hinderance and much contact and in effect insulate the surface,especially if the air temp is close to the surface temp, actually causing it to retain heat.

at highway speeds its ok no lose of power even when getting into it like who can afford that these days gas at 3.23/ gallon in ny only wants to stall and lose of pressure after being caught in low speed cruises and like i mentioned in last message im going to put a clear fuel line between regulator and the carb close hood down almost closed watch for air bubbles in line very puzzled bob in ny

What ever happend to this issue. Is it resolved and if so what was the cure?-Brant