Hello having problems with my fuel pump it is sending the fuel into the sending unit tank to quick I would fill up the tank and be at 300 miles and drive a block and it will be at 298 miles toll refill anyone know why

 

Welcome to the forum.

I'm not sure I fully understand your question. Are you concerned because the estimated range changed by 2 miles after driving only one block? If so, the estimated range is only a rough approximation, based on fuel quantity and the recent rate of fuel consumption. Normal sloshing in the tank will easily cause a minor change at the sending units, and the computer will quickly change its calculations to match. AFAIK, the programming isn't smart enough to catch you've only driven 100 feet since the last guesstimate was made.

 

i am not sure how to put this but say i just put gas in the tank and its about 3 quarters if a tank full and i drive about 10-15 minutes it would be at half tank by then would it be possible a fuse can make the pump send the fuel faster to the sending unit

 

In a word... no. Your S-type has a "saddle bag" tank arrangement, with a fuel pump and sending unit on the right side and a passive "transfer pump" and sending unit on the left side. The car's electronics takes input from both sending units and combines them to prove the output to the fuel gauge. You may be having a problem with this part of the system.

 

More details in this training guide:

http://www.jagrepair.com/images/Elec...troduction.pdf

See pages 38-41.

 

Cant seem to open that link

 

Look about halfway down on this page:

JagRepair.com - Jaguar Repair Information Resource

You will see a link for "S-Type 2000 Introduction".

 

It sounds like the float that measures the level might be sticking. The float is on the passenger side and is part of that pump assembly. How long since you put tank cleaner in the tank? The float is also part of the electrical system. Try turning your key on and off a few times. You'll hear it energize and see if that helps.