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Old 08-02-2010, 23:27   #1 (permalink)
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Grand Marquis '98 Problem Filling Up With Fuel

Hi,
I have a Grand Marquis '98 and everytime I go to fill up, the gas doesn't seem to go down into the tank quick enough causing the trigger on the pump to keep clicking off. I have to fill up very slowly. When I have filled up there is a strong smell of gas inside the car like its coming through the air vents although Im not sure if it is. This lasts for a couple of minutes then dissappears.
Whats causing this?
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Old 08-03-2010, 05:43   #2 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

It's just the design of the fuel filler neck; my car does the same thing. When you're getting gas only put the nozzle about 3/4 of the way in so that it's touching the top of the tube instead of resting on the bottom. This keeps it from building up back pressure and stopping the flow of gas every few seconds.

As for the smell, I've only had that happen once and I couldn't figure out why. Check the tank for leaks especially where the filler neck is attached and in the trunk where someone might have accidentally drilled into the tank while installing sound equipment or a trunk organizer.
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Old 08-03-2010, 12:04   #3 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

According to their other post, this car was in a frontal crash which deployed the airbags.
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Old 08-04-2010, 11:47   #4 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

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Originally Posted by jwko View Post
According to their other post, this car was in a frontal crash which deployed the airbags.
Yes it was in a minor front end collision. Just had to swap out the radiator and housing along with the header panel and lamps etc.

However this problem was happening BEFORE the accident anyway. Its always been like it even from new.
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Old 08-04-2010, 19:02   #5 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

There's an evap solenoid under the trunk pan that might be causing the problem. I can't explain the operating principles behind it yet as I'm still learning about it myself but I've had to change out a couple of these at work. Topping off the tank is the cause of these solenoids going faulty as gas pours down into a bypass tube or some other secondary tube and corrupts/damages these solenoids. If you're having trouble filling beyond ¾ tank as well, it's generally a dead giveaway that solenoid if faulty. If you find that you do need to replace the solenoid, you can prevent it from failing again by not topping off the tank. That means once the gas pump stops, don't retrigger the nozzle. I'll edit this if and when I can explain the fault a little better.
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Old 08-05-2010, 09:48   #6 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

I was also told that it could be a small ball thats in the filler tube getting stuck. The ball is there to stop people syphoning off the gas. Is this true?
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Old 08-13-2010, 17:29   #7 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

Here's the filler neck out of a Crown Vic gas tank. I cropped the pic to show the bottom end of it. It's got a spring loaded plunger and a cap that would make siphoning pretty difficult. I suppose it could also be the cause of slow fueling but I haven't heard about them being faulty in the shop. Maybe Bert would have some insight on filler neck failures.

Unfortunately, the reason I can show you this is because we've had to change three gas tanks this week from rust under the tank straps. Apparently, the winter salt has been getting itself completely up into the rubber braces on the bottom of the tank straps and and eating into the tanks.
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Old 08-13-2010, 17:36   #8 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

We haven't had any filler neck failures on our fleet. My car had the light on and all I did on mine was clean a piece of hair from the sealing surface. One had a leak in the canister from a hard hit in a pursuit. We don't have any rust problems here at all so nothing like no_common_sens mentioned. If you're in an area like that, it would be a possibility.
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Old 11-19-2010, 15:26   #9 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

I had the same filling problem with my 99.

Put the hose nozzle into the tank nozzle and then swing it around 180 deg so that the hose nozzle is 'upside down'.

Learned the technique from a 'petroleum engineer' at the local Exxon station. We don't have self serve here.
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Old 12-01-2010, 20:49   #10 (permalink)
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Re: Grand Marquis '98 Problem Filling Up With Fuel

Quote:
Originally Posted by no_common_sens View Post
There's an evap solenoid under the trunk pan that might be causing the problem. I can't explain the operating principles behind it yet as I'm still learning about it myself but I've had to change out a couple of these at work. Topping off the tank is the cause of these solenoids going faulty as gas pours down into a bypass tube or some other secondary tube and corrupts/damages these solenoids. If you're having trouble filling beyond ¾ tank as well, it's generally a dead giveaway that solenoid if faulty. If you find that you do need to replace the solenoid, you can prevent it from failing again by not topping off the tank. That means once the gas pump stops, don't retrigger the nozzle. I'll edit this if and when I can explain the fault a little better.
You know I should of read your post better. I have fixed the problem. It wasnt so much the solenoid under the trunk pan as it was the breather hose that comes from it to balance out the pressure in the tank. The hose was wrapped around the back subframe and kinked. I unwrapped it and put it back into the clips and its now fine to fill up.

Thats one problem solved!
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