efi pre filter
Thread Starter
Racer
Joined: Mar 2020
Posts: 334
Likes: 113
efi pre filter
hello i have an 82 c3 fitted with efi i have a fuel filter fitted between the forced fuel command center to throttle body . do i need another filter between the tank pump and command center . cheers kev
Melting Slicks
Joined: Apr 2001
Posts: 2,030
Likes: 363
From: Lubbock Texas
I'd run this by the manufacturer of the command center to see if they recommend a pre-filter. I've recently converted my '73 to EFI and did quite a bit of research. I have an in-tank pump that goes to a pressure regulator under the hood and from there to the fuel rails. My filter is just before the pressure regulator. I found no recommendations for a pre-filter in my situation. For installations using an inline pump between the tank and the engine, it seemed a pre-filter between the tank and the pump was universally recommended.
DC
Burning Brakes
Joined: Jun 2020
Posts: 881
Likes: 113
My common sense says install an Accessible filter as close to the in-tank pump as is practical.
I agree -- run it by the EFI mfr; unless they can a make a credible argument to Not install the filter, I'd proceed with a filter
I agree -- run it by the EFI mfr; unless they can a make a credible argument to Not install the filter, I'd proceed with a filter
Safety Car
Joined: May 2001
Posts: 4,761
Likes: 1,648
From: Fairfax Virginia
I too recently swapped out a pile of carburetors for a Holley EFI system. I did it to my 1968 C3 with its 427 and what a difference.
They sold me a new Holley Fuel Tank Module that had the fuel level sensor and the (WalBro 255 Liter/Hour) fuel pump and (60 psi) Regulator on mounted inside the tank when running. I installed the new module very easily as the 1968 fuel tank has a hole in the bottom of the tank for the fuel level sender. I drained out the tank and had it set up for 58 psi in less than half an hour. One of the nicer parts was they give you a small piece of the new Holley Hydra-Mat to suck the fuel into the system without letting air get into the lines. The Hydra-Mat is a great idea and fairly new so it is expensive.
Since the regulator is inside the fuel tank it eliminates a lot of potential issues. I was planning on replacing my entire fuel tank to get a good tank for the EFI system. The folks who sold me the system told me about the Fuel Tank modules and that saved me another couple hundred dollars. Today the only way to tell if it is EFI or carburetor is to look at the fuel pressure gauge. This exactly what I was trying to accomplish.
They sold me a new Holley Fuel Tank Module that had the fuel level sensor and the (WalBro 255 Liter/Hour) fuel pump and (60 psi) Regulator on mounted inside the tank when running. I installed the new module very easily as the 1968 fuel tank has a hole in the bottom of the tank for the fuel level sender. I drained out the tank and had it set up for 58 psi in less than half an hour. One of the nicer parts was they give you a small piece of the new Holley Hydra-Mat to suck the fuel into the system without letting air get into the lines. The Hydra-Mat is a great idea and fairly new so it is expensive.
Since the regulator is inside the fuel tank it eliminates a lot of potential issues. I was planning on replacing my entire fuel tank to get a good tank for the EFI system. The folks who sold me the system told me about the Fuel Tank modules and that saved me another couple hundred dollars. Today the only way to tell if it is EFI or carburetor is to look at the fuel pressure gauge. This exactly what I was trying to accomplish.
Burning Brakes
Joined: Jun 2020
Posts: 881
Likes: 113
HydraMat's a Great idea; It assists pickup while helping to prevent schmutz from entering pump. But
Pump's vanes often fail bit-by-bit; those bits are pushed toward motor and foul things along the way. HydraMat can't affect that.
Hence, suggestion for Accessible filter downstream of pump.
Many/most later model FI pickups/vans have an OE filter mounted mid-truck to hard-line along frame rail; Accessible & easy to buy. Takes a little work.
Pump's vanes often fail bit-by-bit; those bits are pushed toward motor and foul things along the way. HydraMat can't affect that.
Hence, suggestion for Accessible filter downstream of pump.
Many/most later model FI pickups/vans have an OE filter mounted mid-truck to hard-line along frame rail; Accessible & easy to buy. Takes a little work.
