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this is best set up i'vs seen yet. i assisted djvcuda installing it in his cuda when he went to the fast ez efi on his tunnel ram. they did a really nice job with in tank pump. it takes a off the shelf GM pump which makes things easy if you need to replace it..

you can order a new tank from them with that piece already welded in it or you can just buy that piece and weld it in yourself..


http://www.rockvalleyantiqueautoparts.com/ndex.htm







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With EFI, I've run stock pickup/rail mounted pump and in tank pump. Both work but some big differences.

With a carb, the fuel bowl holds enough fuel to keep the engine going during a momentary disruption of fuel supply, not so with EFI. If the pickup is uncovered briefly, the EFI system looses pressure and the engine runs lean or stumbles so keeping a steady fuel supply is critical.

With a stock style pickup/non-baffled tank, the general guideline is never go less than 1/4 tank and never less than 1/2 tank for aggressive driving. I don't know how much the special pickup you pictured helps.

The other consideration is the fuel pump itself. High pressure EFI pumps do not like intake restriction. They will cavitate, make a lot of noise and fail. Pumps in the size range of the Walbro can work OK with a 3/8" or 1/2" pickup and careful plumbing... high capacity pumps like the A1000 cannot handle the restriction. The high capacity pumps need a sump and -10 intake line to be reliable. I've got a couple of hurt A1000 pumps to prove it.

An tank pump or sumped tank is a lot better than the frame rail mounted pump/stock pickup. On my hotrod, I made the switch to an in-tank pump (Bosch pump good for around 700 HP) and am happy. Its just a little expensive.

There is another good option... a sump tank. The basic idea is to set up a proven low pressure pump (Holley Blue, Airtex Rotary ect.) to feed a frame mounted sump of about 1 quart capacity and feed the high pressure rail mounted pump from the sump. The low pressure pump continuously fills the sump with excess fuel routed back to tank return using a common return line with the engine regulator return. I am thinking of doing this to put EFI on a brand F pickup. There don't seem to be commercially available sump tanks (except top fuel $$)so making the sump itself is a hardware store/home improvement store project.

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You might want to look at the in tank fuel pump with reservoir conversion from Tanks Inc. www.tanksinc.com It uses a Walbro pump and its actually not that hard to install. Simple as cutting a hole with a hole saw, in my case flattening out a ridge on the top of the tank, and drilling a few holes. Took me about 5 hours in total. Some people may move faster or slower than me.

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With EFI, I've run stock pickup/rail mounted pump and in tank pump. Both work but some big differences.

With a carb, the fuel bowl holds enough fuel to keep the engine going during a momentary disruption of fuel supply, not so with EFI. If the pickup is uncovered briefly, the EFI system looses pressure and the engine runs lean or stumbles so keeping a steady fuel supply is critical.

With a stock style pickup/non-baffled tank, the general guideline is never go less than 1/4 tank and never less than 1/2 tank for aggressive driving. I don't know how much the special pickup you pictured helps.

The other consideration is the fuel pump itself. High pressure EFI pumps do not like intake restriction. They will cavitate, make a lot of noise and fail. Pumps in the size range of the Walbro can work OK with a 3/8" or 1/2" pickup and careful plumbing... high capacity pumps like the A1000 cannot handle the restriction. The high capacity pumps need a sump and -10 intake line to be reliable. I've got a couple of hurt A1000 pumps to prove it.

An tank pump or sumped tank is a lot better than the frame rail mounted pump/stock pickup. On my hotrod, I made the switch to an in-tank pump (Bosch pump good for around 700 HP) and am happy. Its just a little expensive.

There is another good option... a sump tank. The basic idea is to set up a proven low pressure pump (Holley Blue, Airtex Rotary ect.) to feed a frame mounted sump of about 1 quart capacity and feed the high pressure rail mounted pump from the sump. The low pressure pump continuously fills the sump with excess fuel routed back to tank return using a common return line with the engine regulator return. I am thinking of doing this to put EFI on a brand F pickup. There don't seem to be commercially available sump tanks (except top fuel $$)so making the sump itself is a hardware store/home improvement store project.

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Yes, the loss of pressure when running the tank under 1/3 full or so can cause problems. I have 2 SMPI cars with frame-mounted pumps (one Walbro [Viper], one Bosch [Turbo Carerra]), and they are both fine as long as you don't run 'em low. The Bosch was very noisy until I added a small accumulator teed in nearby -- that totally quieted it down.

Not all in-tank pumps are created equal. Chrysler OEM pumps have a sump, approx 1.5 qts, as an integral part of the design, so the primary pickup is always sumbmerged -- kinda like a wet sump oiling system / scavenge/pressure. I have seen many other brands that don't have that feature.

That multi-corner pickup described above looks very interesting. Does the tank need to be sliced apart for that to be installed? Not the end of the world, but then you'd lose the OEM-style terneplating / rust resistance.

Rick

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