So after my weber install I have noticed that my fuel pump sounded louder, also after running the truck a while, Shutting it off, then going back to start it maybe an hour later, I have noticed before I hit the key the fuel pressure regulator gauge is up to like 15 PSI, not the recommended 3.5 I had it set at. Well after taking ALOT longer to start almost like its flooding out from that pressure, and it stalling a little after take off. I decided to hook the return line back up from the fuel tank and see how that worked

well Now I never have to touch the gas for it to start, The pressure never loads up after the trucks been shut off for a while, and the truck almost seems to run smoother. and the fuel pump is not loud at all anymore!

the needle jumping a little on the regulator is the only problem I have seen. like less than 1 PSI. but it does smooth out under acceleration.

So heres my main question, why are we required by weber to cap off the return line and what purpose does this serve??? Also what can I hurt by letting the fuel pump return???

 

Sounds like yours is a case where the return line should be left alone. I still have mine with a regulator, and while I haven't gauged the pressure, it runs smoothly at all throttle positions. I installed a 32/36 on my buddy's Dodge D50, and it would stumble after we got up to speed. Blocked the return line, and she runs great.

 

Flowrate and bouncing around fuel pressure. I have holley regulator on mine set at 3.5psi it no issues with he return line blocked off. But My fuel pump is slightly louder. Probably because of the internal regulator to it.

15 psi sounds kinda high for that fuel pump to put out BTW even with the return line blocked off. How old is the fuel pump?

What regulator are you using? No reason if the regulator is set right it should creep up to even 7psi as long as it's working properly. If it's one of those stupid dial type Mr Gasket regulators pitch it right in the garbage can and get a Holley one.

 

I bought the holley regulator and replaced the fuel pump the same day I put the weber on, wanted to make sure everything was up to par.

The high pressure only builds after the truck is shut off and sits a while. its really weird, But it does not do it now with the return line hooked up. I swear she runs better with it hooked up. I am going to leave it hooked up for now and keep the stuff in the glove box to plug it back up on the road if need be. I have also entertained the though of putting a cheap Mr. gasket on the return and maybe setting it to 5 psi so it will still bled off after the truck is shut off, but also restrict it enough to keep the fuel pressure gauge from jumping. Kind of a shot in the dark but worth a try to me.

Thanks for the reply's guys, keep the coming

 

Where would a return line hook up to a weber?? These trucks can be finicky and not always the same so I'm curious to see if this could solve my fuel pressure problems.

 

The return line doesn't hook up to the Weber, it goes from the fuel pump back to the tank. I honestly don't even know which line it is on my 83, I never had to do anything besides put the regulator in line from the pump to the carb.

 

Ok, I know what you're talking about now. I was starting the get worried that you had something on your Weber that I didn't have and that would just be completely unacceptable!! LOL

 

Well I might...if you aren't afraid of tuning a little and want some more low end throttle response, search for "sync link kit."

 

I wouldn't recommended that sync link kit to someone that's new to webers or even carb's in general. I know my way around them rather well, and I am a tad bit worried about using one of those. I think I should buy one of the Weber tuning books to get to learn the innards a little more then I do.

 

It just seems daunting at first, but I can see your point. Anyway, to make all this relevant, Steve if you try another regulator on the return line let us know how that works out. You're almost making me curious enough to get a gauge on my system and see what it's really at.

 

I don't see the return line having pressure in it. If so it would be rather negligible. Probably not enough for even a 0-10 psi gauge to pick up. At least not one properly working and not plugged up for some reason.

 

True, but I'm still running one of the cheapo Mr Gasket regulators. More interested in how well it works than anything else.

 

Wait, are we talking about a guage on the return line or the supply line after the regulator? I'm confused.

 

Haha, for me I'm talking about a gauge after my regulator. I don't see what another regulator on the return line would really do, besides isolate the pressure build up to the tank(if mounted that direction).

 

I have the holley on the fuel line directly to the weber with the gauge, I am talking about putting a cheap mr gasket on the return line to the tank just to see if I can slow the bouncing needle down on the feed line. but still leave room for the system to bleed back off into the tank after the truck is shut off, For some reason my system is building pressure after the truck is shut down and flooding it out, without the return line hooked up, but with it hooked up its bleeding off back to the tank and does not flood or load up the carb. I may do the regulator on the return line this sat and see the results. either way it can't hurt it, It can only slow the needle jump down or make it start loading back up after shut down.