getting a code 54 my fuel gauge no longer works. would be gauge no longer working set this code? or is it something else setting this code off? i just bought a whole new sending unit assy.. my exhaust is about 4 months old (came on the car when i got it) i'm thinking if i have to dismantle it to take the tank out to put in the sender i minus well do 2 things while at it. 1 get a hp fuel pump as i'm planning on future upgrades and 2 get a good cat back exhaust seing i have to pull it half of it down anyway. so if it's just the sending unit causing the 54 i can live with it for a few.

 

Code 54 on the '86 MAF f-body's is a fuel pump relay failure. This just means that the relay that drives the fuel pump is not providing the proper voltage. The relay is probably failing.

RBob.

 

strange as it is, i have had a constant service engine light. the car has been hard starting also. anyway, i pulled the codes and now no service engine light and get this, it's starting great. guess the relay is a good call. probably on the fritz. i'm going to replace it, chances are next time i won't get lucky and have a lazy one, next time it won't work at all thanks for your input. i just got the car last week. it had a rough idle so i gave it a compl. tune. took the dist. cap off and the rotor FELL OFF! must have had the luck of the irish . drove the car for about 15 miles and parked it in my garage. one more mile/minute and it would have died! the fuel gauge doesn't work and a complete sending unit came with it but i'm going to check it out. might not even be a faulty relay. thanks