Quick EFI question
Thread Starter
Pro
Joined: Sep 2002
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From: Pinellas Park FL
Quick EFI question
It is worth putting a good sized fuel filter before the pump to assist with possible fuel starvation using the stock fuel tank and feed? Im thinking of the canister type which are about 6 inches deep. I don't want to get into modding the tank.
- Ron
- Ron
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Joined: Sep 1999
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From: Plano TX
You should never put a regular filter before the pump. They don't do well with any kind of restriction on the suction side. You can put what is known as a "pre-filter" on the suction side. It should be rated at no less than 100 microns.
Don't think it will help with sucking air. Once the air is in the filter, how will it get out except through the pump and injectors?
Don't think it will help with sucking air. Once the air is in the filter, how will it get out except through the pump and injectors?
Burning Brakes
Joined: Oct 2008
Posts: 1,037
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From: Mobile Alabama
The electric pumps are "pushers" rather than a mechanical pump that can better pull a suction. The fuel also cools the electric pump. This is why it is better to have a sump or baffles to ensure a steady supply to the electric pump. The pre-filter is just a screen to prevent large particles from entering the pump, while not restricting flow. If your filter was an empty shell it could act as a surge tank and help with starvation problems.
Thread Starter
Pro
Joined: Sep 2002
Posts: 546
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From: Pinellas Park FL
Thanks Zwede, I had the same thoughts but don't have a lot of experience with injection. Just trying to come up is a basic solution to install the FAST EFI system using the stock tank etc.
Burning Brakes
Joined: Oct 2008
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From: Mobile Alabama
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From: South Western Ontario
I'd think you could build a surge tank system if you use some type of canister that is mounted lower than the tank and the fuel line is coming out of the bottom of the tank and going into the top of the canister. Make sure the line is big enough and straight enough from tank to canister so that the air will pass back up the line into the tank allowing the canister to gravity fill. Take the return line to the canister as well.
You are dreaming if you expect to draw the fuel from the top of the tank with a single pump and use an inline canister ahead of the pump as a surge tank.
You are dreaming if you expect to draw the fuel from the top of the tank with a single pump and use an inline canister ahead of the pump as a surge tank.
The ORIGINAL and bestest
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From: Toronto Ontario
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Your idea will not work for the above noted reasons.
Unless you instal a surge tank, external sump, or internal sump/baffles, you WILL have fuel starvation problems under 1/4 tank.
If you are willing to put up with it, then there is no reason to mod the tank.
You've already seen what I built for my fuel system, I have had exactly zero issues with it, even with less than 4 litres (1 gallon) left in the tank.
Unless you instal a surge tank, external sump, or internal sump/baffles, you WILL have fuel starvation problems under 1/4 tank.
If you are willing to put up with it, then there is no reason to mod the tank.
You've already seen what I built for my fuel system, I have had exactly zero issues with it, even with less than 4 litres (1 gallon) left in the tank.
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The ORIGINAL and bestest
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From: Toronto Ontario
Toronto Events Coordinator
The ORIGINAL and bestest
Joined: Oct 2000
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From: Toronto Ontario
Toronto Events Coordinator
Here is a link to the FAST product support forum where you can directly ask the FAST engineers all your questions:
http://www.cpgnation.com/forum/fast-...t-support.html
http://www.cpgnation.com/forum/fast-...t-support.html
Burning Brakes
Joined: Mar 2012
Posts: 871
Likes: 73
From: Memphis Tennessee
If you get a later tank there is a big area to drop a pump into.
Still requires fabrication, but you won't have to mod the tank itself. I used a camaro fuel pump just because I already had it, but I think a pump out of an Astro van would work better. I've checked it out, and it looks like it would work with less fabrication. The good thing about these OEM pumps is the plastic housing fills up with fuel and eliminates the need for baffles.
Just a guess, but the C5 filter probably has a different pressure than the Fast setup. I considered it for my car, but the pressure was about 10psi higher than my LT1 runs.
Still requires fabrication, but you won't have to mod the tank itself. I used a camaro fuel pump just because I already had it, but I think a pump out of an Astro van would work better. I've checked it out, and it looks like it would work with less fabrication. The good thing about these OEM pumps is the plastic housing fills up with fuel and eliminates the need for baffles.
Just a guess, but the C5 filter probably has a different pressure than the Fast setup. I considered it for my car, but the pressure was about 10psi higher than my LT1 runs.
The ORIGINAL and bestest
Joined: Oct 2000
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From: Toronto Ontario
Toronto Events Coordinator
If you get a later tank there is a big area to drop a pump into.
Still requires fabrication, but you won't have to mod the tank itself. I used a camaro fuel pump just because I already had it, but I think a pump out of an Astro van would work better. I've checked it out, and it looks like it would work with less fabrication. The good thing about these OEM pumps is the plastic housing fills up with fuel and eliminates the need for baffles.
Just a guess, but the C5 filter probably has a different pressure than the Fast setup. I considered it for my car, but the pressure was about 10psi higher than my LT1 runs.
Still requires fabrication, but you won't have to mod the tank itself. I used a camaro fuel pump just because I already had it, but I think a pump out of an Astro van would work better. I've checked it out, and it looks like it would work with less fabrication. The good thing about these OEM pumps is the plastic housing fills up with fuel and eliminates the need for baffles.
Just a guess, but the C5 filter probably has a different pressure than the Fast setup. I considered it for my car, but the pressure was about 10psi higher than my LT1 runs.
I believe those were 75-77 tanks. The gas filler hole is in the same place from 68-77, so those later tanks *should* work on an earlier car, but I don't know that for sure. The Rock Valley #119-1511-sr stainless steel fuel pump module comes made to fit your tank, and is an easy weld-in solution. It costs about $400, and includes the Walbro 255 pump. I paid my local fabrication shop $100 to weld it in for me.
http://www.rockvalleyantiqueautopart...o_and_kits.pdf
The ORIGINAL and bestest
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From: Toronto Ontario
Toronto Events Coordinator
It is hard to see in this pic, but maybe these will help
