Question about 1981 Ford F 150

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I have a 1980 F150 pickup that does not pass the smog test because it has two gas tanks, does that matter or might it be something else?

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Replace the catalytic converters and rebuild the carb, it will then pass 100%

Posted on Jul 19, 2009

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Failed smog test ; gross air leak at vapor recovery system. Replaced gas cap from parts house with a dealer supplied gas cap and the gross leak is gone but a minor air leak is...


If you just want to get through the smog test,they usually allow one monitor test to be incomplete and still pass.
If your area does,clear the codes and fill the fuel tank to the top.The other monitors should run and complete but the fuel tank monitor will not run with a full tank of gas so will not turn on the check engine light related to a tank vac leak.KEEP THE TANK FULL,and go get your smog test!

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P0440 evap control system malfunction


Code 440 is for a leak found in the gas tank vent system.
The computer vents the gas tank to the vapor canister and there is a leak somewhere in the system.
Sometimes it is the gas cap.

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the first thing i\I would try is to replace the Oxygen sensor...this happened to me on my 91 F150 pickup and that cured it..

May 31, 2012 | Ford Ranger Cars & Trucks

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Didn't pass smog due to fuel leak? It passed the emission part of the smog test, however failed because of gas vapors leaking from the fuel system. What should I check first to locate the leak?


Fuel tankes have only one large acess on the top i sugest checkin the rubber gasket for cracks or perishing also check along the fuel lines for damp spots use your nose to locat the strongest area of gas then go from there hope this helps:)

Oct 21, 2011 | Cars & Trucks

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1985 Ford F-150 Failed Smog - Gas tank failed pressure test.


Basically what he does is pressurizes the tank and all the lines up to the charcoal cannister.
Anywhere from the hose from the filler neck to the tank could be cracks or loose clamps.

The top of the tank has a seal for the fuel pump and rollover valves. These are rubber and could be leaking.

Under the hood you will see the charcoal cannister inbetween the radiator and engine on the passenger side. The hose could be unplugged or cracks. Or the cannister may of failed. The cannister is unseviceable
except for the valve thats on it if it has one.
You could spend a couple hours trying to find the problem especially if it on top of the tank.

What the shop will do is pressurize the tank again and with the smog machine sniffer they can stick it where you can't access to see if it can smell fumes.
Takes a shop 10 minutes to find the area if you want to know.

Feb 15, 2010 | 1985 Ford F150

3 Answers

How do I find how many gallons my fuel tank is on my 1997 f-150


1997-1998 Ford F150 Pickup Gas Tank -4x2 Regular Cab 6-1/2 Box 179.9
1997-1998 Ford F150 Pickup Gas Tank -4x4 Regular Cab 6-1/2 Box 219.95
1997-1998 Ford F150 Pickup Gas Tank - Super Cab 6-1/2 Box 179.95
24.5 gallons

Hope helps (remember rated this). Good luck

Feb 12, 2010 | 1997 Ford F150 Regular Cab

1 Answer

Smog test will not pass


This code is send (in your case NOT SEND)
by the fuel sending unit.

Does your fuel gauge give incorrect of jumpy reading when it's full?

The quick fix is STOP TOPPING OFF the fuel tank when you are get gas.

Keep topping off will push the fuel tank float off it's sensor limit and eventually short or send OUT OF RANGE reading to the fuel gauge.

Fill your truck up to 3/4 tank full.

Drive it for 2-3 days or about 100 miles.
(this will fill the ready-ness data that DMV want)

If there is NO check engine light ON during the 2-3 days then give the smog test another shot.

DO NOT add fuel unit you complete the smog test.
===

The CORRECT method to fix your problem is to drop the gas tank and replace the fuel sending unit.

If you truck has over 140,000 miles on it then I will recommend you the change the WHOLE integrated fuel pump/fuel sending unit and fuel filter at the same time.

Jun 02, 2009 | 1999 Isuzu Rodeo

1 Answer

EGR System .....Not Ready


Try running a tank of Supreme gas & a can of SEAFOAM in the gas tank. It might clear up your problem????? Go chance of it.

Feb 13, 2009 | 1996 Chevrolet S-10 Pickup

2 Answers

Hi, my car today failed in smock check,the emissions test fail, and I don't know how to read de results, can you help me to read and fixed the problem?


Go to AutoZone or Kragen and get a $9.00 bottle of PASS ANY SMOG TEST or double
your money back (keep your receipt). You just pour it into your gas tank at a FILL UP and run
that gas down then refill your tank and take your Smog Test. It will pass. What state are you in??
What are your smog test numbers??
MikNas in California

Aug 14, 2008 | 1989 Toyota Corolla 2 Door

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