Fuel Pump Relay Issues
August 30th, 2016, 2:33 PM
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Fuel Pump Relay Issues
As of lately, I have been having an odd issue with my 02 Blazer. The issue is that the fuel pump relay, which has been replaced with a brand new one from the parts store, is showing major signs of heat damage, and also along with that, the car has issues starting and staying running. Sometimes the car shuts off while driving, and afterwards, the car refuses to start up until you pull the relay and re-insert it. We have ran some tests with the relays, using both a jumper cable and the relay itself, and here are the results.
Pin 30 to ground with the engine off gives 12.45 volts.
Pin 30 to ground with the motor running gives 13.70 volts.
Pin 87 to ground gives 13.7 volts as well.
Pin 86 to ground gives 0 volts.
The relay for the fuel pump has been showing heat damage around pins 30 and 87, including burn marks and melting of the relay itself. Keep in mind this is the new relay, not the old one. As well as showing damage, this isn't slow heat build up, it happens quite quickly when the engine is running, making the relay way to hot to touch. We were just wondering if anyone on this forum has had the same issues that we are having, and maybe you have found a solution to the problem. Thanks!
Pin 30 to ground with the engine off gives 12.45 volts.
Pin 30 to ground with the motor running gives 13.70 volts.
Pin 87 to ground gives 13.7 volts as well.
Pin 86 to ground gives 0 volts.
The relay for the fuel pump has been showing heat damage around pins 30 and 87, including burn marks and melting of the relay itself. Keep in mind this is the new relay, not the old one. As well as showing damage, this isn't slow heat build up, it happens quite quickly when the engine is running, making the relay way to hot to touch. We were just wondering if anyone on this forum has had the same issues that we are having, and maybe you have found a solution to the problem. Thanks!
August 30th, 2016, 4:10 PM
#2
CF Monarch
As of lately, I have been having an odd issue with my 02 Blazer. The issue is that the fuel pump relay, which has been replaced with a brand new one from the parts store, is showing major signs of heat damage, and also along with that, the car has issues starting and staying running. Sometimes the car shuts off while driving, and afterwards, the car refuses to start up until you pull the relay and re-insert it. We have ran some tests with the relays, using both a jumper cable and the relay itself, and here are the results.
Pin 30 to ground with the engine off gives 12.45 volts.
Pin 30 to ground with the motor running gives 13.70 volts.
Pin 87 to ground gives 13.7 volts as well.
Pin 86 to ground gives 0 volts.
The relay for the fuel pump has been showing heat damage around pins 30 and 87, including burn marks and melting of the relay itself. Keep in mind this is the new relay, not the old one. As well as showing damage, this isn't slow heat build up, it happens quite quickly when the engine is running, making the relay way to hot to touch. We were just wondering if anyone on this forum has had the same issues that we are having, and maybe you have found a solution to the problem. Thanks!
Pin 30 to ground with the engine off gives 12.45 volts.
Pin 30 to ground with the motor running gives 13.70 volts.
Pin 87 to ground gives 13.7 volts as well.
Pin 86 to ground gives 0 volts.
The relay for the fuel pump has been showing heat damage around pins 30 and 87, including burn marks and melting of the relay itself. Keep in mind this is the new relay, not the old one. As well as showing damage, this isn't slow heat build up, it happens quite quickly when the engine is running, making the relay way to hot to touch. We were just wondering if anyone on this forum has had the same issues that we are having, and maybe you have found a solution to the problem. Thanks!
