Gas leaks out of my gas tank recently had a fuel pump put on could that had caused the problem

check and see if there is still a leak when you are not putting gas in it if it is still leaking, lower the tank and check all the hose connection for leaks. replace hose and clamps turn key to run but not start with tank lowered look for leaks

The fuel pump is located inside the fuel tank. If you have a major leak, there are a few things it could be. The filler tube you put gas into during a fill-up goes directly to the fuel tank. The filler tube may have a hole in it; If your tube is rubber, the clamp at the fuel tank may need replaced; you may have a fuel line leaking near the fuel tank, The fuel tank may have a hole in it. A fuel leak is a hazardous situation, so take extra precautions to be safe and have it repaired asap.

The fuel supply and return lines connect to the fuel pump on the top of the fuel tank. And the fuel tank filler neck connects to the tank with a rubber hose. Thats on the side where you put the gas in.

A defective fuel pressure regulator (located on the fuel rail) may have blown the gasket on the
fuel pump (located in the gas tank).
Another thing to check - the car's computer may have posted
an error code from the fuel tank pressure sensor.. I'm not sure, but if this sensor shows pressure
building in the fuel tank, rather than let it explode its seals, the sensor may intentionally leak fuel
in order to relieve the internal fuel pressure build-up inside the fuel tank.

On the fuel rail (supplies fuel to the fuel injectors on top of the engine), there will be a Schrader valve,
which is your connection to connect your Fuel Pressure Gauge to your car's fuel rail.
Give it a check, but put a shop rag around the connector as your screw it in - fuel (and fuel
pressure) will leak as you install the fuel gauge.

You may get computer diagnostic codes P0158 or P0159 - see below for interpretation.
Note that the PCM is the Powertrain Control Module, which is the car's computer.
Also "TP sensor" is the throttle position sensor.
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Trouble Code: P0158

Meaning: HO2S-22 (Bank 2 Sensor 2) Circuit High Input

Possible Causes:

Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)

HO2S element is silicon, water or fuel contaminated

HO2S signal circuit is shorted to system power (B+)

HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits

PCM has failed

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Trouble Code: P0159


Meaning: HO2S-22 (Bank 2 Sensor 2) Slow Response

Possible Causes:

Exhaust leak present in the exhaust manifold or exhaust pipes

Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)

HO2S element is silicon, water or fuel contaminated

TP sensor element broken (can cause false acceleration event)

I would put a couple gallons in a can and put in my trunk i know that, If there is no apparent visual leak, no puddle under car.then maybe its a bad fuel read. I would drive car and see how far you can go on that E read. After you get that gas can with a couple gallons in it,and dont forget the funnel. THat car should get at least 120 mi on 6.5 gallons, so its a good size leak to pump out 5 gallons in a 20 mi stretch. i think you would smell it. so hopefully its just one of those weird moments.

Chrysler and Dodge have a fuel vapor filter that allows air out of the gas tank but filters the harmful fumes. Usually the problem happens from topping off your gas after the gas pump stops due to the automatic shut off and then putting more gas in the tank (to make the bill an even $50. or to the next $5 increment, or pumping more in just because it fits). Anyway the filter gets saturated with gas, is not able to breath, and causes a vacuum in the tank. Because of this, the anti-siphon ball is not able to float around and sits at the opening of the fuel fill tube and won't allow any more gas to be put in (acts like the car is full). If you pump super duper slow like put a nickel to hold the gas pump handle, it will trickle in without a problem, but it takes forever! Solution, get the filter replaced and don't over fill the tank.

on a dodge neon the fuel pump is in the SIDE of the tank... NOT the top. to remove the pump follow these steps...
******* first unplug battery and remove ********
1. unbolt passenger side tank strap and lower side of tank.
2. a. if tank is plastic, CAREFULLY unscrew plastic retainer ring but do NOT remove.
b. if metal tank, unscrew metal retainer flange but do NOT remove
3. unplug electrical connector and fuel line from pump. move aside.
4. completely remove retainer BE CAREFUL not to disturb pump.
5. have drain pan or wide-shallow bucket available to collect gas. (if tank is full this will need to be able to hold 7-8 gallons)
6. gently twist and pull pump out till gas comes fourth. catch gas in pan/bucket.
7. remove pump when gas stops flowing.
8. install is reverse of removal.
9 BE CAREFUL not to wrinkle gasket or lose gasket into tank when installing or the tank will leak around pump.
10. tighten retainer but DO NOT OVER TIGHTEN.
11. reconnect plug and fuel lines check for leaks.
12. reattach tank strap and fasten
13. refill tank with clean gas. check for leaks.
14. put battery back in. connect battery, start your neon and check for leaks one last time.
15, have fun. this will take about 4hrs to do by yourself with proper tools.

More than likely you have a busted fuel line, or one of the connections from the fuel lines to the fuel pump is broken. If you know how to repair cars, drop the tank and find the leak. If you don't know how, have the vehicle towed to a shop. Driving the car would definitely be a fire hazard.

Fuel Backing up in the fill nozzle is most often caused by a restricted fuel tank vent line. This vent line runs from the tank to a charcole filter that stores the tank vapors while still allowing air to pass. It is typically located in the engine compartment. Look for a pinched hose first in the engine compartment. Typical hose diameter is 10 mm or less. If you have had recent work done on the car in the fuel tank area, this also may have resulted in the line being pinched or rerouted in error.

good luck

its the electrical connection at he fuel pump,if this is ok ask if they replaced the strainer on your fuel pump,your fuel pump is inside your gas tank ,you have to drop the tank to service,most fuel pumps are not warrantied if you dont change the strainer,when your car shuts off the sediment on the strainer falls back into the tank,but when you run your car and it sucks up the gas thru the strainer to the pump it clogs the strainer and the fuel pump cant pump,you shoiuld find out if they changed this because your forcing your fuel pump to work harder,was it a new fuel tank or used one that they put in