Fuel pressure/reg/pump questions
Thread Starter
Pro
Joined: Mar 2003
Posts: 629
Likes: 20
From: Texas
Fuel pressure/reg/pump questions
I have been reading the various posts with respect to fuel pressure, fuel regulators and pumps. I keep seeing reference to "boost".
My understanding is that the pump in the tank runs at one rate all the time and that the pressure regulator returns the fuel back to the tank when the set pressure is reached. So what then is this "boost"?
Also, is there an recommended inexpensive aftermarket adjustable fuel pressure regulator as an alternative to the fixed stock fuel regulator/filter.
I'm putting an LS1 in an older vette so I'm thinking of using an aftermarket regulator and separate fuel filter. This will provide more options in terms of fittings and I can use an inexpensive fuel filter with a clear viewing port so that I can visually see if the filter needs to be replaced.
I assume that the stock reg/filter has a check valve such that when it is off, it holds pressure to the fuel rails. I'm not sure if this is common to all aftermarket three port fuel regulators, but it sure makes sense that they would have this check valve.
Thanks,
My understanding is that the pump in the tank runs at one rate all the time and that the pressure regulator returns the fuel back to the tank when the set pressure is reached. So what then is this "boost"?
Also, is there an recommended inexpensive aftermarket adjustable fuel pressure regulator as an alternative to the fixed stock fuel regulator/filter.
I'm putting an LS1 in an older vette so I'm thinking of using an aftermarket regulator and separate fuel filter. This will provide more options in terms of fittings and I can use an inexpensive fuel filter with a clear viewing port so that I can visually see if the filter needs to be replaced.
I assume that the stock reg/filter has a check valve such that when it is off, it holds pressure to the fuel rails. I'm not sure if this is common to all aftermarket three port fuel regulators, but it sure makes sense that they would have this check valve.
Thanks,
Drifting
Joined: Mar 2005
Posts: 1,737
Likes: 0
From: Northern VA
I have been reading the various posts with respect to fuel pressure, fuel regulators and pumps. I keep seeing reference to "boost".
My understanding is that the pump in the tank runs at one rate all the time and that the pressure regulator returns the fuel back to the tank when the set pressure is reached. So what then is this "boost"?
Also, is there an recommended inexpensive aftermarket adjustable fuel pressure regulator as an alternative to the fixed stock fuel regulator/filter.
I'm putting an LS1 in an older vette so I'm thinking of using an aftermarket regulator and separate fuel filter. This will provide more options in terms of fittings and I can use an inexpensive fuel filter with a clear viewing port so that I can visually see if the filter needs to be replaced.
I assume that the stock reg/filter has a check valve such that when it is off, it holds pressure to the fuel rails. I'm not sure if this is common to all aftermarket three port fuel regulators, but it sure makes sense that they would have this check valve.
Thanks,
My understanding is that the pump in the tank runs at one rate all the time and that the pressure regulator returns the fuel back to the tank when the set pressure is reached. So what then is this "boost"?
Also, is there an recommended inexpensive aftermarket adjustable fuel pressure regulator as an alternative to the fixed stock fuel regulator/filter.
I'm putting an LS1 in an older vette so I'm thinking of using an aftermarket regulator and separate fuel filter. This will provide more options in terms of fittings and I can use an inexpensive fuel filter with a clear viewing port so that I can visually see if the filter needs to be replaced.
I assume that the stock reg/filter has a check valve such that when it is off, it holds pressure to the fuel rails. I'm not sure if this is common to all aftermarket three port fuel regulators, but it sure makes sense that they would have this check valve.
Thanks,
Thread Starter
Pro
Joined: Mar 2003
Posts: 629
Likes: 20
From: Texas
If you are transplanting, by all means use a rail mounted regulator. You want to make sure that the filter you use can handle 60psi pressure. I haven't seen any which have a "viewing port". You basically want to emulate the 97-98 C5 system. You will need a check valve to prevent bleed off. I think a lot of pumps may have these integral. You definitely don't want to use the 99+ stock filter...
I'm not sure what you mean by "rail mount". Do you mean fuel rail?
The setup I'm considering is this:
Tank --> Fuel Filter --> Fuel Pump --> Fuel Regulator --> To front of vette to Fuel Rail. Fuel Regulator return --> to tank
The pump and filter would be in the back near the tank.
Do you think the filter on the inlet side will pose a problem?
Last edited by split63; Mar 9, 2007 at 03:01 PM.
Drifting
Joined: Mar 2005
Posts: 1,737
Likes: 0
From: Northern VA
Wouldn't do much good mounted anywhere else I don't think 
I would think regulator should be at the outlet of the fuel rail. The stock rail I believe has provison to mount one. The returnless systems have a pulse damper in it's place.
The system you want to create is just like any other return style EFI setup.
I would think regulator should be at the outlet of the fuel rail. The stock rail I believe has provison to mount one. The returnless systems have a pulse damper in it's place.
The system you want to create is just like any other return style EFI setup.
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
The boost you are asking about is most likely refering to supercharged/ turbo fuel systems. Some people have am aftermarket pump added to supply additional fuel at high RPMs under boost. The system is set up to turn the pump on when the car is under a boost condition to supply additional fuel.
