weber carb/ fuel press regulator

[Anonymous]

i got a weber 32/36 DGEV carb. pretty much installed now with the clifford adaptor plate. at clifford they told em to use a pressure regulator on the carb set to 2.5-3 psi? is this necessary? does high pressure mess up the float? he said it was necessary because the carb is very efficient and does not need a lot of fuel. it seems that the float valve should keep the bowl full as long as pressure is high enough. i'm just having some trouble understanding why a regulator is necessary. can anyone help me understand this better? i'll put one in, but i just want to learn more about what is going on.

thanks.

 

[Falcon62]

Yes, you need to regulate fuel pressure to less than 3psi with the Weber. Anything higher than 3psi will force the needle off its seat. Weber carbs are designed with lighter springs on their floats than most domestic carbs.

 

[amartin83]

A regulator is necessary in a lot of cases but I would say to try it without a regulator first. My Weber 38/38 has no problems so far on a mechanical pump with out a regulator and I have run it for at least 1200 miles since the install. If it doesn't work out, then get a regulator. I have read that webers can tolerate up to around 4 psi and that many mechanical fuel pumps put out anywhere from 2 to 5 psi.

Aaron

 

[xctasy]

It's no biggie for a stock Carter fuel pump to dial in over 6 psi! The reason for the fuel regulator is that it limits the needle and seats work. On a bumpy road, reducing pressure improves fuel consumption and there is less likely to be hot fuel handling problems.

Up to you. The Weber is cheap and has a parts inventory on it, so it's your call.


(If you want to, you can get foriegn Webers and fuel pumps with blead back to the fuel tank...quite a lot of work. They run 6 psi, but blead off the additional gasoline to the vapour chamber on top of the fuel pump. This totally eliminates any heat soak and hot fuel handling problems because the fuel is always being circulated around the float chamber. Ford Australia did this in 1973-1982 with the Cortina's 2.0 2-bbl Weber 2-bbl Pinto engine, and again form 1982 to 1993 with the Falcon 3.3/4.1 with Weber 2-bbl ADM 34 carb).

 

[addo]

Having had the experience of irregular fuel pressure (crook regulator), I would say do the regulator thang. It's eliminating one more variable, and is a great chance to dress up the lines a bit, and with real purpose.

Get a tubing bender, stainless line, an oil-filled gauge, a polished or billet reg... There are differences in quality. Some of the cheaper ones allow pressure creep and also bleed back at rest.

Regards, Adam.

 

[mcmillal]

I just recently installed a regulator and gauge, set it to 3.5 to 4psi and set the carburetor float to factory spec. I like the improvements. Much better idle and, maybe it's just me, throttle response. I think playing with the float setting had as much to do with it as anything. Before these changes I was experiencing fuel dribbling in the secondary at idle. Now I don't.

...........Alex

 

[Anonymous]

i found some pressure regulators from jegs. plus they have some guages too. do i just mount a guage on the regulator and leave it on there for good. or do i mount it adjust the perssure, then shut off the car, take it off, and plug the hole?

if i do leave it on there should i get a fluid filled guage.

thanks!

 

[addo]

Leave it on. There's an imported gauge oil-filled, 1½" that's about $17. It's fine; the plug for the hole will run you $2 and gives no information. Buy the best regulator you can afford, and ensure you have the correct fittings to make it happen (it can be costly when you then need to track down other stuff at short notice).

 

[strat1960s]

I was told that I needed a fuel pressure regulator for my Weber 38DGAS. I got one and the car ran like crap. I tried to adjust the regulator up and down and got no change in how the motor ran/ or would not run. I got a fuel pressure guage and found out that the regulator was not working at all, it was causing a fuel restriction. So, just for kicks I took the regulator out and the motor ran like a champ. In other words if you get a regulator, keep your receipt, you may want to take it back to the store for a refund.
Ted