I've got about 10 mpg ever since I bought my 86 4runner. However, after I bought it, I noticed there was no vaccum line connected to the bottom of the fuel pressure regulator and it was leaking gas. I know it is supposed to return the excess fuel to the tank but there is no where to connect a line going to the tank. So, I spliced a 3 way into the return fuel line and connected the regulator line to that, but...I'm still getting the same bad gas mileage as always but without the fuel leak. Any suggestions/info on where the regulator vacuum line is supposed to go or why I'm getting such bad gas mileage?

 

well i see you're SAS'd....that would probably be the reason why ya got the bad gas mileage....

and if you're SAS'd then you most likely have bigger tires..that contributes a lot..you might not be geared properly and that contributes even more lol.

have ya done a tune up?? plugs, wires, cap, rotor, oil, everything..lol

if you're carbureted then i suggest takin that dude apart and cleanin it up/rebuilding it...then properly adjust it. lol

 

I'm not sure on the horrible gas mileage, but maybe I can help. The vacuum line just needs to be one from the plenum. Doesn't really need to be from an exact location. Have you jumpered your light to see if it throws any codes? Could be a number of things, TPS, AFM, o2 sensor.......

 

well when he said regulator...i assumed he was running an aftermarket carb lol..or a stock carb..

but if the EFI trucks have regulators then my bad LOL

 

I had big tires but I took them off a while back to see if anything changed and it didn't. I just can't see a 4 banger getting that bad of gas mileage no matter what you do to it.

 

If you can post pictures of what you mean about the regulator, please do.

However, the regulator should have a small vacuum line (approx. 1/8" ID) connected to the top of it which connects to the intake. It should also have a larger fuel line (approx 3/8" ID) that returns fuel to the fuel tank via a metal line that runs down the firewall and back to the tank.

 

You may want to check that the return line isn't blocked for some reason or other, preventing the excess fuel from returning to the tank.

 

bad o2 sensor ?

 

You are talking about the back side of the fuel rail where the vacuum line comes out of the top...Thats not the fuel pressure regulator. The fuel pressure regulator is at the front of the fuel rail, just below the #1 injector, with a vacuum line coming out of the bottom which is 1/8" i.s. diameter, and a 3/8" i.s. diameter line coming out of the side going to the fuel filter.

 

a wheel might be locked in four wheel drive

 

If it hasn't had a tuneup in a while I'd definitely give that a shot. Insufficient spark can cause all kinds of problems that you might attribute to something else. Check your TPS and MAF as well, could be a bad O2 sensor. And if all that doesn't fix the problem at least you've got the satisfaction of having a nice tuned up motor once you do fix the real problem.

If you decide to give it a tuneup we sell:
plugs, wiresets, fuel filters, O2 sensors, and air filters. All NGK and Denso stuff, other brands too.

Use YTECH10 at checkout for 10% off your order

 

Zack, your website does not have a listing for toyota pickup in the vehicle finder.

 

It's there, just hiding from ya. I put in '86 22RE just so ya know

http://www.sparkplugs.com/results_ap...1&AAIA=1277412

 

Most gasoline companies use methanol [alcohol] to stretch supplies. Also winter mixes use alcohol instead of MTBE outlawed for smog reduction. I have heard Luke Oil? has up to 20% alcohol. You don't get good mileage on alcohol. Try different brands.