I have a 1990 Toyota truck (cant find a model name on it). It wants to run (cranks and sputters) but has just today started smokeing when it dose this out of the tail pipe. The "smoke" has a strong smell of unburned gas. I pulled the dip stick to find it is now way over full and there is gas in the oil. I noticed some gas arround the bottom of the carb like it has started leaking a little bit. I have seen other posts about how it (the fuel pump and or gasket) can leak gas into the oil. There is no water in the oil (I checked) and the level of antifreeze in the radiator is fine. What I am wondering is...Is this a matter of the "leaking" fuel pump and if so how hard is it to change it and the gaskets out? I do my own automotive work..breaks, belts, wires, plugs, starters, alt, oil changes, ect and am not afraid of trying but I dont have any specialty equipment. Just the standard 14 billion sockets tool set. As a side note I recently replaced the gas cap with a locking typ because someone was stealing my gas at night and am now getting a strong vacume sucking sound when the cap is taken off to fill it. Is this a problem? The old one dident do it. I would really appretiate any help you guys can give me.

285,00 miles short bed reg cab 22r 4 speed manual shift 2 w/d bought for $700.

 

Put the old gas cap on would be first advise.

hmm. i dunno.

I would honestly take it as an opportunity to catch someone stealing my gas and take out my pent up aggression for the last 4 years and demolish them... but that is me... lol

my guess. change gas caps and see what happens

 

could the mechanical fuel pump be leaking into the crankcase. arent those driven off a cam lobe.

 

YES...to the best of my limited knoledge it is a mechanically driven fuel pump.

 

i just re read looks like you have a 90 that should be an RE no mechanical fuel pump

 

maby it should have an RE but it is a 22r..truck was being rebuilt buy the guy I bought it from. no injectors it is a carbed motor. It always felt like it should have another gear (top gear or 5th). Winds up some when doing 55..60 mph but shift pattern is standard H reverse is all the way right and down (no lock out button) He said it still needed some work and many systems (guage lights, dome light, ect) are still no go but guages, head lights, wipers, tail lights, all work. The emmissions stuff (except cat convertor) ac compressor and so on have been removed. Like I said it has been a dream to own till now with no major repairs needed. I just need to know if it is likely to be the pump and how hard it will be to fix if so. Also anyone know the price of the pump in question if it is a mechanical pump?

 

The pump is on the intake side of the engine, on the side of the head. Right up towards the front. You'll see two (maybe 3) fuel lines going right to it from the carb. It's extremely easy. It has, I think, 3 12mm bolts attaching it to the head (maybe only 2...?), and three fuel lines, which you'll just need to loosen hose clamps on.

My only advice, and this is only because it just makes life slightly easier...is to make sure the cam is in the right position...the fuel pump lever is moved because what is maybe called a lobe (?) on the cam is off center, so it has a high side and low side. On its high side, it's compressing the pump lever. On its low side, the lever is all the way out. So if the cam lobe has the high side over at the pump, you're going to have to keep the level depressed to bolt it in, which means pushing hard on the pump while you install it. Much easier if you're working on the low side of the cam lobe and don't have to keep the pump lever depressed to bolt it in. You know? This is a long and possibly confusing description of something which probably won't even matter...but I figured I'd throw it out there...

Good luck! There's possibly a better chance that your carb isn't tuned properly and it's dumping gas into the cylinders, but checking the pump is not a bad idea. There is a weep hole under it, and if oil is dripping out of that, you know the membrane has a hole or tear in it, and it's possibly letting gas into the crankcase.

 

By the way, I've taken the pump on & off probably 6 times once in a hour...it's very quick and easy.

 

Thank you Zach. Now I hope and pray that is the problem. BTW is it going to do any damage to the motor haveing the gas in the oil right now...not useing it and dont have the stuff to drain it...is it better to drain it dry for now or leave as is while unused?

Thank you all for helping.

 

leave it then flush it real good on start up

 

Gas thins out the oil and depending on how much is getting passed the rings can be almost as serious as water in the oil. The rich mixture washes the the oil film off the cylinders and causes wear. The same for the bearings. Put simply.... Gas in oil causes pre-mature engine wear. When the problem is corrected change the oil..... And by the way the 22r was made in 2wd pickups in the early 90s. Believe it was discontinued in 92.

 

And let us know how it goes! My pessimistic side says you have more going on than just the fuel pump, but it very well may be your only problem.

 

I HOPE it is your only problem mang!! Let us know what ya finds.

 

Check the float in the carb and the needle and seat. The float could be stuck allowing fuel to steady pump in the carb.

 

No that checked out ok...I think it is a gasket failure but have not been able to get parts yet and I dont want to take the pump off till I get new gaskets...thanks for the idea though.

 

If the pump hasn't ruptured anything internally, the actual gasket between the pump and head won't let any fuel in. The pump itself has to be failing for there to be any way for gas to get in the crankcase. Can't replace any seals in the actual pump, you just replace the pump.

 

Trucks in the shop now. Still no word on it but I will keep you posted.

 

Definitely let us know what is ends up being!

 

"THE MAN" said fuel pump is bad. Ruptured diaphram. What I need to know now is since I dont know the year of the 22r motor how can I find out and is there any diference in the mechanical fuel pumps from year to year being as that it needs to be replaced. Can I just buy one say for a 85 year model and put it in? It is mechanical and mounted on the motor by the carb.

 

Pretty sure they're all the same. An auto parts store ought to be able to look up the part number, and see if they're all the same. My guess is that they are.