EFI Fuel Pump Upgrade

[gregs78cam]

I will give him a call, and find out and get back to you. As far as the mounting ring, I can draw up an .dxf or .dwg of any dimensions you might need. The first one I made for the Camaro was pretty small, the one for the truck was larger and easier to work with. Were you going to have it cut, or just want some guidelines on size?

I found the larger one. For some reason I can't post .dxf or .dwg, but that is not a problem. These are just for the reinforcing ring that I put INSIDE the tank:
OD 7.5"
ID 5.5"
24 holes on 6.5" bolt circle.

[69crewcab]

I will give him a call, and find out and get back to you. As far as the mounting ring, I can draw up an .dxf or .dwg of any dimensions you might need. The first one I made for the Camaro was pretty small, the one for the truck was larger and easier to work with. Were you going to have it cut, or just want some guidelines on size?

I found the larger one. For some reason I can't post .dxf or .dwg, but that is not a problem. These are just for the reinforcing ring that I put INSIDE the tank:
OD 7.5"
ID 5.5"
24 holes on 6.5" bolt circle.

Ok thanks let me know what you find out.
i was going to plasma one out. Is the inside ring welded in or how? Or I need to go read more lol

[jaros44sr]

hey gregs, great writeup, and followed your instructions, sorta! heres the problem, i lost one of the springs on the support rods, would you happen to have an extra spring

ill post pics later, but thanks for the great write up, it was almost painless

[ony]

I HAVENT DONE ANY COVERTING, but 92 plymoth,dodge mini vans have a 40 psi pump assemble that lay kindof flat you might look at a pic of one could be a possible alturnitive.

[gregs78cam]

hey gregs, great writeup, and followed your instructions, sorta! heres the problem, i lost one of the springs on the support rods, would you happen to have an extra spring

ill post pics later, but thanks for the great write up, it was almost painless

Hi, thanks for the feedback, sorry I have not replied back sooner, I have been EXTREMELY busy for a few weeks. Yes I have a few of the springs, if you still need some let me know, I can throw them in an envelope and send them out.

[oldfoop]

Greg, terrific write-up. I was looking for tank/pump for my truck, found this, and knowing very little about TBI or fuel pumps. I wonder if the tanks you modified had had fuel in them? I have been guessing how you kept from getting blown up - I decided maybe dry ice-carbon dioxide is heavier than air.

I have an old tank form what I think was an early '80s Olds. Has 3 5/8 dia sender in it,and only 8" deep. I wonder if modifying that tank and looking for module that short - I see springs on the tubes, so assume they have some slide adjustability,

Or, should I lok for newer tank with 4 1/8 dia sender opening, and find sender module to fit it, and match my 0-90 ohm guage curve. Can the resistance be changed easily on one of these modules?

Write-up seems to say the additional fuel pressure won't hurt the TBI or regulator.

also, I assume the fittings and electrical connectors won't match the original harness and the fuel fittings may be new to me too.

Hope this isn't too far backwards.

Thanks again for your write-up and I am really glad to find this forum.

[gregs78cam]

Hi, yes all three tanks that I modified have had fuel in them. Fuel in liquid form will not burn, it is the fuel vapors that ignite easily. Two of the tanks were done without any welding. On the latest one though, we drained the fuel out, then blew compressed air through the tank around all the crevices to make sure there was no liquid left in there ANYWHERE. When I didn't see any more fuel and only a slight smell remained I then turned on the shopvac and blew air through it for another 5 minutes or so. Then welded the flange on.

8" might be a bit on the shallow side for these senders. These have about 1 to 1.5" inches of compression built in to them so they always stay pressed against the bottom of a tank. My best suggestion is to just go to your local Pull-a-Part, and drop a few tanks and check out what is there.

The pressure shouldn't be any problem at all, it works just fine for TBI.
Fittings and plugs will be different, but not hard to sort out.
The level senders I used in the write up came with both ohm ranges for different applications, then later they changed style to the one pictured in post 22. These, I believe, were only available in the newer ohm range.

I hope this works for you.

[oldfoop]

Thanks Greg,

I found Spectra Premium makes replacement tanks and senders etc. I looked for anything that would fit space I have, then for sender to match. Hard part is, any tank that fit, I found all have the small sender opening, even though I found some for fuel injection. One has a "sump" in the bottom to prevent dry-run in tight turn or steep uphill run. I think I may wind up trying one of them.

I live in NH, and we don't have pull a part here, they dismantle, and keep what they think will yield the most $, and scrap/recycle the rest -called green yards. Its too bad, because the few yards that have cars out bacl, are being forced to get rid of them. Lots of nice old iron gone for ever.

I wondered about the high pressure of the sender that matches the tanks I think will fit - min press 72.5, and max 130.5#. Too high for TBI? The tanks were in '94 - '96 Blazers and Jimmys, and I think were well after TBI, so much higher pressure. If pressure isn't a problem, these will work well, because they are 0 - 95 ohms sender curve, and my guages are 0 - 90. Close enough. Can you buy replacement resistance cards for senders?

By the way, what is dual TBI? I'm old, but guess I missed this.

Thanks again for your help.