Fuel Pump troubles
 

So on my 93' I have a rusty tank and some unknown fuel pump. I want to do the fuel pump while I drop and treat the tank. I've been recommended the Walbro 255 but I've read that it doesn't like the dual voltages that come from the ECU so that what you're supposed to do is run a relay from the battery. Well then you run rich at idle and low rpms. Is there anything I can do to combat the running rich from the constant higher voltage going to the pump? FPR maybe? My car is pretty much stock at the moment. Am I better off going with the denso supra pump that can be wired directly to the existing wires? But then I run the risk of voltage drop, don't I?

The mystery fuel pump. Can’t seem to find it off those numbers anywhere.
https://cimg6.ibsrv.net/gimg/www.rx7...ba6107fa8.jpeg
https://cimg8.ibsrv.net/gimg/www.rx7...b2dc0ec72.jpeg

Don't know where you saw about the Walbro having dual voltage problems. I've been running a Walbro 255 in my car with factory dual voltage (upgraded input voltage to the factory system) with zero issues for probably 10 years.

Dale

How can I do that upgrade?

Look for "fuel pump rewire" - you can basically feed the circuit opening relay (that's the relay the fuel pump gets power from) to feed straight from the battery.

Dale

I may not drink but I owe you a few beers. I appreciate you always helping me out. I’ll take a look at that as soon as I get off work.

Does anyone know if the plastic slosh tank in the fuel tank can come out? I’m going to coat my tank and I think it should come out while I’m doing it.

You might be better off just buying a new tank. I don’t think the plastic comes out and I doubt the coating will stick to it. I don’t think new tanks are terribly expensive.

The plastic tank does come out with a little persuasion and some heat with a heat gun in order to bend it without breaking it. Just make sure the tank is very dry and has sat out in open air for a while.

I would like a new tank but they’re $800. I can treat the tank for $50-70. As long as I can get the plastic out. My rust isn’t as bad as a lot that I’ve seen so I think the coating will work nicely.

https://cimg7.ibsrv.net/gimg/www.rx7...8bf8f6374.jpeg
https://cimg0.ibsrv.net/gimg/www.rx7...9e79e247f.jpeg
https://cimg1.ibsrv.net/gimg/www.rx7...1ba2b4629.jpeg

What if you just treated it with evaporust instead of doing a coating?

Pretty sure the tanks have a protective coating to prevent corrosion and you’d most likely take the rest of it along with the rust. Leaving your rust to come back quicker than before.

The coating MAY peel and cause problems down the line. Some recommend derusting and running it, keeping it full to prevent rust from returning.