5.3 swap in K5, need new fuel tank for 2003 fuel evap system
I'm planning my smog-legal 2003 5.3 swap into a 79 K5 Blazer, and in California I have to utilize the fuel evap system from the 2003 donor truck. I have everything else lined up, except for a suitable fuel tank. The K5 tank doesn't have the valve in the tank or the evap, so I'm looking for ideas. Do I need to have a custom tank built or can someone give me the part number for the proper valve so I can drill and weld it into my K5 tank? Has anyone come across a solution that does not involve using a misshapen Tahoe/Yukon tank?
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
Can you use one from a later model that was efi 87-91?
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
I used the sending unit and fuel pump (new parts) from a 2000 Camaro which fit my 87 fuel tank and it had a port for the evap hose, I just need to hook up the canister.
Will that help? |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
That is what I used and it even fixed my broken fuel gauge!
The 87 tank has a well for fuel injection and the 2000+ Camaros have LS engines and the right fuel pump pressure for your engine. A little plumbing and a 10 micron filter.........only money ! |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
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Pictures would be amazing, if you're in the mood :) |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
The tank I used is for a 87 short bed truck it has a well for the 2000+ Camaro pump the SENDING UNIT is for a 87 Chevy truck, it has pressure and a return port along with a vent port for the evap hose connection.
I have several thousand miles and there is no starvation on the set up |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
I used a Dorman new gas tank for a 87 chevy truck that has a "well" in the bottom for the fuel pump to set in to keep it from running low or starving when turning corners when the fuel level is very low
Was that the answer? |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
i added an evap can to my set up. was really pretty easy. now the garage doesn't stink.
you might need to go in and turn the evap codes back on, most base tunes have them turned off. |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
After re reading your post I see that it is a Blazer, did they have a EFi throttle body in 87 for the Blazer?
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
It's not going to be that easy you are going to have to do some tricks here to get it through
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
If the Camaro sending unit isn't a direct fit you should still be able to make things fit like NastyBuzzard did here: http://67-72chevytrucks.com/vboard/s...=627161&page=9
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From all of the reading online and over-the-phone conversations with my local smog ref, it doesn't seem like it's going to be that bad. I have a complete wrecked Yukon that I'll be swapping everything over from and as long as I keep all of the cats, O2's, and evap system in place from the newer truck, I shouldn't have any issues. I'll just have to be sure the tuner doesn't disable all of that stuff when they re-flash my ECM. |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
Well for a 2003 the only part of the evap system that is mounted on the fuel tank is the fuel tank pressure sensor. The charcoal canister and vent solenoid are separate, and the purge solenoid is mounted up on the intake manifold. So really you can use any fuel injection capable fuel tank, and just find a way to make the fuel tank pressure sensor read the pressure/vacuum of the tank.
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
Sorry for the delayed response.
So as it stands, I have EVERYTHING figured out. I have step-by-steps and write ups saved, parts lists and numbers saved, and I did inventory on the donor and the K5 and made a list of things I have to buy. The ONLY thing I haven't figured out yet, is how/where to put the fuel tank pressure sensor. The sensor literally just pops into place in a hole on the top of the fuel sending unit. Now I'm wondering if its really as simple as drilling a hole in the top of the K5 sending unit (my k5 has fuel evap already so I'm not going to replace it)? Should I cut fuel sender from the 2003 and have a shop drill and attach it to my K5 tank? can I just drill a matching diameter hole in the top of my K5 tank, pop the sensor in place and call it done? Anyone ever done this before? I'd LOVE to hear from you. :lol: Thanks! |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
I plan on adapting the newer sending unit to my stock tank (89 K5 w/TBI) for my swap. If you have a brand new tank you can have a shop weld an adapter ring to it or if you're using an old tank you can use some two part epoxy and small hardware to mount the plastic locking ring area of the donor tank to your steel tank (that's what I'm trying first). NastyBuzzard showed us what both of those methods look like in his build thread: http://67-72chevytrucks.com/vboard/s...=627161&page=9
The TBI sending units are already pretty crowded and I don't think you'd be able to find enough open real estate to mount the FPS on it. You may be able to mount it somewhere else on the tank but I'm not sure how far it would stick up or if you'd run in to any clearance issues once you go to mount the tank back up... |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
Most people that do this swap use a TBI tank and sending unit from an 87 truck/Blazer and then install an AC Delco EP381 fuel pump since it's a direct replacement for the TBI pump and supplies the higher fuel pressure and flow that the LS engines need. Most people also don't have to worry about smog and remove the cats, evap system, etc. and tune all of that stuff out of the PCM.
Since you're trying to do a CA smog legal swap (like me) you'll have to be keep all of that stuff in place and it sounds like you're on the right track so far. You may be able to use the stock sending unit if you can hook up all of the required lines for the newer system but then you'll still need to add the FPS somehow. OR you could just adapt your tank to accept the newer sending unit that already has everything you need in one piece. There are a couple of different ways to do that depending on budget and how pretty you want it to look lol. Not sure why you think you'd need custom gauges for the newer sending unit though? I've seen a few guys use them before and I think they just added a small resistor to the wiring so that it had the proper resistance for the stock gauge to read properly. I'll see if I can find the thread for how they did it and post up a link. There may be more ways to get the same stuff done and I hope others will chime in with some other tips or suggestions. I'm just passing along what I've learned so far and plan on doing for my swap in a couple of months. |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
I just skimmed but in regards to the gauge thing; you can use a resistor to adjust the sweep of the sending unit depending on which exact parts you end up using. I don't have the link handy, but on Stovebolt (and I'm sure here too) there are some threads about using resistors from new to old and old-to-new alike.
FWIW I don't even have a sending unit, I just use the fuel calc in the Scanguage that I run in my dash. Its not exact since it uses injector pulse to "Assume" how much fuel is being used, but its just a way to know when to pull over. |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
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MID-POST EDIT: I did a quick couple of Google searches and it would seem that I have to run the TBI sender. Bummer, but no big deal. I did read that the fuel gauge will work the same as long as its a square body truck. Do you know how people are wiring the in-tank sender to the rest of the truck though? It is just a plug? How would I go about wiring that TBI sender? Back to Google on my next break to see what I can find. :) |
Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
The pressure sensor doesn't have to be mounted directly on the tank. It can be anywhere in the evap line between the tank and the charcoal canister, because the evap line will have the same pressure as the tank.
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Re: 5.3 swap in K5, need new fuel tank for 2003 fuel evap system
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