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Old 16-05-2010   #1
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Seicento fuel/tank/guage problem

Hello everyone,

About a month ago my Fiat went in for MOT and failed due to a leak in the rusted fuel tank. They wanted 400 to replace it, and I knew that was stupid. So, I bought an after-market tank from Ebay and had my brother-in-law install it. After correcting a couple of drips at the nozzle where the petrol in put it, it passed MOT.

However, when I fill up, I get a strong smell of petrol inside and outside the car. The fuel guage has always been crap in this car, but the other day, after going around a sharp curve, it went into the red, light came on (as usual), but it never worked again. It just stayed on "empty" with the light on, even though I knew there was about 1/2 tank of fuel in the car.

I am told this is probably either:

1. A bad sending unit, or
2. a stuck float in the tank

I removed the cover plate under the back seat and noticed that the plastic cover moves around over the opening in the tank, though it seems securely in place. There is nothing about the look of it that is diagnostic. There are bout 12 small bolts holding the unit in. If I remove those bolts and lift the unit out, will I be able to tell if the float is the issue? Also, there are electrical wire attached. Should I disconnect the battery cable before attempting this? If it is the fuel sending unit, where is it?

I would very much appreciate an experts knowledge, because, as you might expect, don't have a lot of confidence in asking my brother in law.

Any help very much appreciated.

Bob
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Old 16-05-2010   #2
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Re: Seicento fuel/tank/guage problem

The sender unit is in the middle of the pump assembly. You need to take it out to take the pump out. It turns anti clockwise, use the two 'u' shaped mouldings.

The connector is a right angled thingy. the three wee prongs in the sender can get distorted if the clip isn't removed properly.

Cheers

SPD
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Old 16-05-2010   #3
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Re: Seicento fuel/tank/guage problem

Quote Quote:
The sender unit is in the middle of the pump assembly
Thank you for taking the time to answer my post. Please pardon my ignorance, but where is the pump assembly? Is it in the area that I am looking under the rear seat?

I assume you believe the symptoms I described as being caused by the sensor?
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Old 16-05-2010   #4
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Re: Seicento fuel/tank/guage problem

Quote Originally Posted by Bobnutfield View Post
Thank you for taking the time to answer my post. Please pardon my ignorance, but where is the pump assembly? Is it in the area that I am looking under the rear seat?

I assume you believe the symptoms I described as being caused by the sensor?
yep under the rear seats below that diamond shaped cover

Ash
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Old 16-05-2010   #5
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Re: Seicento fuel/tank/guage problem

Thank you. I will remove that and see what I can find.

Bob
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