I keep mine strictly regulated with a quality fuel pressure regulator. It runs best around 2.5 psi at 3k rpm. Any less and it gets starved, any more and it floods after shut down. I wouldn’t mind a good FI setup because these carbs can be finicky.
I’ve gone to a Carter rotary pump since then and blocked off the case where the mechanical pump was. Also found a better gauge to prove the pressure to me. It’s amazing how important proper fuel pressure is to how the car/bus runs!
@@bomberobus Hi Bombero. I am also using the carter pump in my brazilian beetle and it is running great, but I would like to know what is the exact fuel pump pressure you are measuring from the carter pump?
@@hectorugarte2526 ooops…yes I did measure that Carter. According to the new gauge it read 2.5 idling but increase to 3 with throttle. The Bus runs a lot smoother and had better start ups with that pump, and the carbs don’t leak, but I also rebuilt them.
Great video. I have just replaced my old fuel pump for a Pierburg german fuel pump and I want to make sure I have the correct fuel pressure. Very nice bus btw. Thanks,
I’ve never ran one but I hear that the Pierburg is an excellent fuel pump. I just don’t trust any fuel pump as far as pressure delivery goes. Thanks and good luck.
Thanks. A question I've wondered too. I run an SU carb on my 1600 sp which has a float bowl vented to atmosphere (an issue I'll address soon). There's potential for a fire there so a gage might be wise addition to minimize overflow potential.
Great video thanks for taking the time to put it up. I feel your test was inaccurate and here is my reasons why. First the pressure should have tested at higher RPM to simulate cruising speed. This is a mechanical pump with that in mind the pump is pumping more cycles at higher RPM than at idle. Second the 0-100 fuel injection gauge will not give you a good low pressure read. Fuel injection systems require higher pressure fuel delivery and thus fuel injection pumps operate at high pressure normally over 30 PSI. Thus a gauge designed to read high pressure and this gauge is not usually calibrated to be as accurate at low pressure. The smaller gauge was most likely closer to accurate as it should be calibrated to be reading low pressure flow. I have a Brazilian fuel pump that puts out close to 10 psi at 3200 rpm not to say they all do but it's best to check them for this reason. I run my 48 IDA's at 1.5-2 psi on my 2109CC and they have never starved for fuel on a 8000RPM pull. Keep up the good work I know how hard it is to keep the content flowing.
Yes to all of that👍. I did get a better gauge, but installed the Carter electric pump shortly thereafter. That’s great info! Thanks for hangin out, and I love your Bug. That color is sweet
Good Info Mike, The Problem Im solving in Bess ATM Fuel In The Case Im swapping out the Fuel Pump Cheers Bro Oh I Just Seen I already replied Before ,Not Only Was it Weeping Fuel It was Going In the Case Not good
Great video. I have a 79 with FI. Not running carbs. Any idea what that fuel pressure should be?
Thanks
I keep mine strictly regulated with a quality fuel pressure regulator. It runs best around 2.5 psi at 3k rpm. Any less and it gets starved, any more and it floods after shut down. I wouldn’t mind a good FI setup because these carbs can be finicky.
A 0-5psi gauge is what should be used, accuracy is in the mid range, your pump should be set to ~2.8psi @ 3400 rpm
I’ve gone to a Carter rotary pump since then and blocked off the case where the mechanical pump was. Also found a better gauge to prove the pressure to me. It’s amazing how important proper fuel pressure is to how the car/bus runs!
@@bomberobus Hi Bombero. I am also using the carter pump in my brazilian beetle and it is running great, but I would like to know what is the exact fuel pump pressure you are measuring from the carter pump?
@@hectorugarte2526 ooops…yes I did measure that Carter. According to the new gauge it read 2.5 idling but increase to 3 with throttle. The Bus runs a lot smoother and had better start ups with that pump, and the carbs don’t leak, but I also rebuilt them.
Great video. I have just replaced my old fuel pump for a Pierburg german fuel pump and I want to make sure I have the correct fuel pressure. Very nice bus btw. Thanks,
I’ve never ran one but I hear that the Pierburg is an excellent fuel pump. I just don’t trust any fuel pump as far as pressure delivery goes. Thanks and good luck.
that first gauge showed 4. there are 5 splits till 10. and 3 till ten left, so it's 4psi
Yes, which was still too much. I’ve installed a Carter pump in since then and it’s at 2.5 psi.
Good eye bro, I noticed that too. 👍🏼
Thanks. A question I've wondered too. I run an SU carb on my 1600 sp which has a float bowl vented to atmosphere (an issue I'll address soon). There's potential for a fire there so a gage might be wise addition to minimize overflow potential.
I need that exact fuel pump, do you have a part number?
The local parts store had that Brosol pump on hand, it looked like the part number was 20255.
@@bomberobus thanks!
No problem Isaac. 🤙🏼
Nice Vid Bro , Thanks Ive got to Check Mine Its weeping Fuel around the Pump
Mine started weeping too. Replaced it with a Carter rotary pump and the pressure is spot on even when revved. Best thing I’ve done for that engine.
Great video thanks for taking the time to put it up.
I feel your test was inaccurate and here is my reasons why. First the pressure should have tested at higher RPM to simulate cruising speed. This is a mechanical pump with that in mind the pump is pumping more cycles at higher RPM than at idle. Second the 0-100 fuel injection gauge will not give you a good low pressure read. Fuel injection systems require higher pressure fuel delivery and thus fuel injection pumps operate at high pressure normally over 30 PSI. Thus a gauge designed to read high pressure and this gauge is not usually calibrated to be as accurate at low pressure.
The smaller gauge was most likely closer to accurate as it should be calibrated to be reading low pressure flow.
I have a Brazilian fuel pump that puts out close to 10 psi at 3200 rpm not to say they all do but it's best to check them for this reason. I run my 48 IDA's at 1.5-2 psi on my 2109CC and they have never starved for fuel on a 8000RPM pull. Keep up the good work I know how hard it is to keep the content flowing.
Yes to all of that👍. I did get a better gauge, but installed the Carter electric pump shortly thereafter. That’s great info! Thanks for hangin out, and I love your Bug. That color is sweet
@@bomberobus Thank you, Carter is the way to go for accurate fuel delivery.
Good Info Mike, The Problem Im solving in Bess ATM Fuel In The Case Im swapping out the Fuel Pump Cheers Bro
Oh I Just Seen I already replied Before ,Not Only Was it Weeping Fuel It was Going In the Case Not good
Thanks Brian. I always got caught sniffing the dipstick 😂. The kids thought I was crazy, but they know why…now.
What is the normal/correct preasure for an original vw bug carb?
I THINK the spec on that is 2.8