what are you guys useing for a regulator for your weber? Are you useing a bypass regulator ( one with a return line ) or just a regular limiting regulator? The pump im useing is just a pos electric pump, so im not sure which one im supposed to use or which one webers are happier with....thanks
Here we go again First it would be best to find out what your pos fuel pump is putting out pressure wise then determine if you need a regulator or not. A non bypass regulator will only maintain pressure when fuel is flowing through it, a bypass reg will maintain a set pressure better allowing the fuel to bypass back to the tank when its deadheaded against the needle valve when the bowl is full. Most any carb would probably be happier with a bypass reg especially if the pump is putting out more pressure than the carb recommends.
Im running a very simple inline regulater set at 3.5 psi on my 32/36 i cant tell if it helped but its on there
i heard the webers liked a solid 5 psi.... ok ill make a return regulator then, the pump im useing can go up to 7 psi and i dont want to burn it up by having it fighting the regulator. Or is that normal?
The weber DGV's like around 2-1/2 to 3 psi max, by using a bypass regulator its taking the strain off the electric pump and the carb needle valve, that just lets the pump run at a constant speed all the time letting it run cooler and not putting pressure against the needle valve which can lead to flooding. Running a simple inline regulator to control pressure will still work, its just that the pressure is not real consistent, it fluxuates up and down all the time.
I was just going to run the stock pump which has a bypass built in. I can't see it being too much for the Weber since it has the bypass and the stock carb I would imagine wouldn't need more PSI. I may be wrong though. Do '80 PUs have electric pumps? I know my old '77 Celica did.
well i kinda put this is sorta the wrong area, the motor is an early 22r, the truck is a 75 though..so im taking out the mechanical pump that was on the 18R and putting in an electrical pump near the tank.
To be honest I,ve never had any problems running a 32/36 off the stock pumps. An 80 p/u should have a mechanical pump on the passenger front corner of the head. The intank electric pumps at least on the earlier 75-78 trucks have a bypass already in the line inside the tank.
Nook, your my best friend...we think a lot alike. I too have never used a regulator or even an aftermarket fuel pump on any downdraft weber. Here is an old pic of my 4x4 setup Mechanical fuel pump outlet straight to weber inlet...no problems with this setup
the mechanical fuel pump on my 22R has 2 outlets, one return and one to the carb....whats up with that? and the body of the truck is a 73..i think thats different then the 75 right?
Some of the mechanical pumps have two, some have three. Doesn't matter, just as long as one's going to the carb inlet, and the other is going back to the tank
Nice... you answered some of my questions about getting the Weber on there without me even asking.... easy! Thanks!
so the next question is, is there an electric pump in my tank? i just looked before i left for work and it looked like there was only one wire going to the tank, and i assume thats for the fuel sender.. ****ty pic of my 22r.. notice the highrise on the weber buddy traded me it cause it wouldnt fit right on his motor thanks joe!
No, there is no electric pump in your tank. When looking at the picture, you can see that there is a mechanical fuel pump on the intake side of the engine. Its that round copper looking item at the very front of the cylinder head. Electric fuel pumps were usually on EFI equipped models. Nice high rise. I had one of those on my 4x4, didn't notice any difference in gains though.
poop, well ill give the high rise a try and see how it works. i figured that there wasnt a pump in the tank, remember im doing this for a motor swap, so the truck isnt running yet and you can see not much is hooked up. Im going to run an electric fuel pump with no regulator then, the pump only makes 4-7 psi so i dont think it should be a problem for Mr. weber....hopefully
Nice job, she looks like she can be fired up soon! If your going with the elctric pump route, i'd go with a Carter fuel pump. Its rotary in design so you don't have to worry about diaphragms and seals going out. It also dishes out a steady and consistent 4psi and 72gph...plenty enough fuel for our webers. Its also not as loud as other electric fuel pumps if you soft mount it to your frame. Part number is 4070 I believe.
i already got some pos fuel pump laying around here at work, brand new in the box.. im going to use it cause its free, and free is good. this engine swap is costing more then i orignally got the truck for.
