Cascade Crew

aaron_sK · Posted: Thu Jun 24, 2010 8:24 pm Post subject: Fuel tank differences?

So I swear, planning for this buildup has me reading TGO once again, after I thought I had sworn that hive of scum and whatnot off for good.

Problem is certain things have never occurred to those mouth-breathers, things like swapping from a carb to EFI. Bashy Bashy

The bottom line:

-Is there any difference year-to-year in gastanks? (Other than the mysterious late-model baffled tanks)
-Is there any difference from carb to multi-port tanks?

Thanks, guys. Thumbs up

Alphius · Posted: Thu Jun 24, 2010 9:12 pm Post subject:

I have personal, in-depth knowledge of three different tanks:

'87 2.8 Sport Coupe - MPFI
'87 Trans Am WS6 - TPI
'84 Z28 L69 - Carb with helper pump in-tank

All tanks were the same, except the '87 TPI tank was baffled. Oddly, that wasn't supposed to happen that early but GM has always been a little fuzzy on stuff like this. Razz

All carb or EFI pickups should go in any tank and work perfectly fine. All three tanks except the baffled one were exactly the same in mounting and dimensions both internal and external. The difference in the baffled one... it has baffles. Laughing

I ended up using the '87 TPI tank in my '84 Z28 with the '87 pickup and a Walbro 255 stuck on the end of it. No problem.

Bottom line Aaron, hit up the JY and grab a tank from any MPFI/TPI car and you'll be good to go. Use the whole tank, or just the pickup. Whatever you want. It all seems to be interchangeable. Only thing I haven't seen is the TBI tank/pickup but I can't imagine it being any different. You may want to grab the hardlines that go from the tank to the engine bay cause it makes plumbing way easier. That's what I did, and all the TPI tank/lines/fuel filter bolted right into my '84 easily. I had a TPI parts car that I used all my old carb stuff to convert to carb after I was done.

aaron_sK · Posted: Thu Jun 24, 2010 9:17 pm Post subject:

My current plan is to find a junkyard car with TPI or a V6 (read: V6 Razz

), drop the axle and the tank, pull the pickup out of the tank, strip the pump off (so I don't have to pay for it Wink

), and then pull all four lines out from under the car.

Then it's Racetronix and Walbro time, baby. Get down and Boogie!

I just wanted to make sure I wasn't going to buy something I couldn't use, and then have to buy a whole new tank.

Alphius · Posted: Fri Jun 25, 2010 5:36 am Post subject:

Perfect.

Should work fine. Not sure about the V6 fuel lines, I don't remember if the size is the same as TPI.

Walbro pump is what I have but I built my own fuel pump harness with 10-ga. wire and a MegaSquirt-triggered relay running through my fusebox directly to the battery. Isn't that pretty much what the Racetronix harness does too?

Twilightoptics · Posted: Fri Jun 25, 2010 5:53 am Post subject:

Walbro in mine with factory wiring and 49psi keeps uo great.

Alphius · Posted: Fri Jun 25, 2010 6:11 am Post subject:

aaron_sK · Posted: Fri Jun 25, 2010 6:26 am Post subject:

91RSVert · Posted: Fri Jun 25, 2010 6:38 am Post subject:

The v6 lines are the same dia. However, how they are bent up in the engine bay are different from v6, TBI, TPI.

The sending unit w/o pump is the same for all of them.

aaron_sK · Posted: Fri Jun 25, 2010 6:44 am Post subject: