20r not running

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prolfe54

Joined
Aug 25, 2007
Threads
1
Messages
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I am trying to get this rig running. I replaced the fuel pump and filter. This will start up, then die shortly afterwards. I let it sit for a few minutes and it will start again.

It seems that fuel is getting to the carb (loosened up the hose and fuel came out at the carb), but do not see fuel in the carb.

any Suggestions???
 
When was the last time the carb was pulled off and rebuilt? Could just be the jets are laquered with dried fuel.
 
If you have no fuel in your sight window, you probly have a stuck float.

I see a carb rebuild in your near future--they are easy and cheap to rebuild....
 
Would the carb create the truck to run for about five minutes, I put more gas in it, then shortly after all the problems happened? I added 6 galons of high grade fuel, lucas gas treatment, and then everything went to heck.

The truck did sit for an extended time before I got it.

One last thing, why would someone wire an universal fuel pump direcdtly to the battery? This has this done and the pump was running the second you hooked up the battery.

Where would I find the carb rebuild kit? I just got this yesterday and I am playing a detective everytime I look at the engine again.

Thanks again,

P
 
What's wong with the mechanical fuel pump? I had to change mine out because it sat in junkyard for 10 years. You could get the carburetor rebuild kit at any local auto parts store and it costs about $40. Just bite the bullet and rebuild it, you wont regret it.
 
You need to post a pic of the engine bay so we can see what is going on, and then go from there.
 
You need to get that electric fuel pump redneck booty-fab crap out of there and put a new mechanical fuel pump on the engine where it's supposed to be. It could be that the electric pump is pushing too much pressure into the carb and has ruined the float valve, which is causing the carb to flood the engine.

Fix the fuel pump situation, rebuild the carb, and you should be good to go.
 
Here is what I found out today as I went back to try and fix it. I asked a mechanic to take a look at it and here are his answers:

The mechanical was replaced because one of the previous owners put in an AC system so they had to replace the fuel pump to an electrical.

I should not rebuilt the carb because of the rust inside and he said the bowl was most likely damaged. He came to this conclusion by us unhooking the fuel line to the carb and seeing a bunch of rust come out of the imput. I stuck a screw driver in the hole and it came out all brown.

He said to find a used carb and rebuild that because it would be easier and less work. He also suggested getting a new carb with an adapter plate.

After hearing all this and not as mechanically inclined as most of you, is this guy telling me the truth or selling me a pile of sh*t?

On a down note, as I was going to work on this truck on Sunday, I totally my Sierry Denali and watched it go up in a ball of flames from the accident I caused.

P
 
Sorry to hear about the Denali.... I hope you're ok. If there's rust in the fuel lines, and all inside the carb..... it may be beyond rebuilding... The fuel lines are going to need to be cleaned out al the way to, and including the gas tank if it's all rusty........ The bottom line is if you aren't into rebuilding a carb getting a working used one is a much easier option, but with the potential rust issue, it may need a lot more work than you're up for....
 
Are there any other carbs that will fit this truck? I think it will be very hard to find a 79 carb for the 20 engine.

I would be willing to buy another one with an adapter if there is something anyone recommends.

if you have an old carb that would fit the 20 engine, I would be interested in talking to you.

P
 
2ndGenToyotaFan said:
Sorry to hear about the Denali.... I hope you're ok. If there's rust in the fuel lines, and all inside the carb..... it may be beyond rebuilding... The fuel lines are going to need to be cleaned out al the way to, and including the gas tank if it's all rusty........ The bottom line is if you aren't into rebuilding a carb getting a working used one is a much easier option, but with the potential rust issue, it may need a lot more work than you're up for....
Click to expand...
If you're going to be putting in a new carb I would recommend changing out the fuel lines to the tanks and remove the tank for leaning, and get a water separator filter. It's going to be worth it. I have just had to much s*** clogging up my lines, and frigging up my carb water, sand etc. I had to change my fuel filter 5 times already. I actually removed the tank and cleaned it but apparently not enough.
 
I broke down and purchased a new carb with an adapter plate. I should be good to go by tomorrow.

Thanks for all the help,

Patrick
 
Did you clean out the lines and the tank?

At the very least install an inline filter and buy about 8 spares, or your new carb will be more screwed than your old one.
 
prolfe54 said:
Here is what I found out today as I went back to try and fix it. I asked a mechanic to take a look at it and here are his answers:

The mechanical was replaced because one of the previous owners put in an AC system so they had to replace the fuel pump to an electrical.

I should not rebuilt the carb because of the rust inside and he said the bowl was most likely damaged. He came to this conclusion by us unhooking the fuel line to the carb and seeing a bunch of rust come out of the imput. I stuck a screw driver in the hole and it came out all brown.
Click to expand...

BS, the bowl is alloy can’t rust and most times easily cleaned. In trucks that have set, most of the time rust in the system is from the tank.

prolfe54 said:
He said to find a used carb and rebuild that because it would be easier and less work. He also suggested getting a new carb with an adapter plate.
Click to expand...

Your carb is likely good/rebuild able. The first step is finding the source of the rust, most likely it’s the tank. When it sits, the vapor area above the fuel has moisture in it, causing the tank to rust. When the truck is moved the rust flakes fall into the fuel and are sucked up into the system, clogging everything up. My first step would be to drop the tank, remove the sender and clean it up. There are several methods, try searching the FJ40 forum for “gas tank rust”. There are coatings that you can put in the tank to prevent further rusting.

If you don’t find the source of the rust and repair it, any new, cleaned parts will suffer the same clogging fate sooner than later. Cleaning the tank, blowout the lines, clean out the pump, carb and replace the filter(s) is the best way to a reliable truck.

prolfe54 said:
After hearing all this and not as mechanically inclined as most of you, is this guy telling me the truth or selling me a pile of sh*t?

On a down note, as I was going to work on this truck on Sunday, I totally my Sierry Denali and watched it go up in a ball of flames from the accident I caused.

P
Click to expand...

He may not be feeding you a pile, just may have never experienced this before and most Techs nowadays have very little experience with carbs, so are more likely to tell you to replace, when cleaning up a carb is a relatively simple job.
 
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