Hi all,
I just bought an AT 04 here recently with 85k miles on it. Engine was rebuilt/replaced by Mazda at 59k in 2009. I just had the plugs and coils replaced. Compression is at 145 PSI on each rotor according to the mechanic I bought it from (he didn't do the standard rotary compression test but says he followed the Mazda manual when testing with his standard piston compression gauge).
Here in the last week, my 8 has had trouble maintaining speeds on the highway when going up hills. No matter how much gas I give her, she doesn't accelerate/increase RPM in 4th gear after reaching a max of 3300 RPM or so. The only way it accelearates is by shifting down to 3rd gear and getting up to a max of 4800 RPM and even then it struggles to accelerate to 75mph going up a hill. I can redline in 1st no problem and still has plenty of pull in 2nd as well. The problem starts to come when I need a little more oomph to maintain my cruise control setting of 70-75mph going up these Kansas hills.
So today, my mechanic looked at the fuel pressure and it would reach 60 PSI when turned on and primed, but as soon as I turned the ignition off, the pressure dropped pretty quickly down to about 20 PSI within 3-4 seconds. Also, when he disconnected the fuel line, he noticed he didn't get much gas decompressing through the line AKA spraying gas everywhere like it should when under pressure.
So my problem is obviously a fuel issue and not the Cat or MAF. My question is do I need to replace the entire fuel pump assembly or is there just a certain part that needs to be swapped out?
I found that the going price these days for a fuel pump assembly is around $180 like this one here:
Anyone find a cheaper one lately?
I just bought an AT 04 here recently with 85k miles on it. Engine was rebuilt/replaced by Mazda at 59k in 2009. I just had the plugs and coils replaced. Compression is at 145 PSI on each rotor according to the mechanic I bought it from (he didn't do the standard rotary compression test but says he followed the Mazda manual when testing with his standard piston compression gauge).
Here in the last week, my 8 has had trouble maintaining speeds on the highway when going up hills. No matter how much gas I give her, she doesn't accelerate/increase RPM in 4th gear after reaching a max of 3300 RPM or so. The only way it accelearates is by shifting down to 3rd gear and getting up to a max of 4800 RPM and even then it struggles to accelerate to 75mph going up a hill. I can redline in 1st no problem and still has plenty of pull in 2nd as well. The problem starts to come when I need a little more oomph to maintain my cruise control setting of 70-75mph going up these Kansas hills.
So today, my mechanic looked at the fuel pressure and it would reach 60 PSI when turned on and primed, but as soon as I turned the ignition off, the pressure dropped pretty quickly down to about 20 PSI within 3-4 seconds. Also, when he disconnected the fuel line, he noticed he didn't get much gas decompressing through the line AKA spraying gas everywhere like it should when under pressure.
So my problem is obviously a fuel issue and not the Cat or MAF. My question is do I need to replace the entire fuel pump assembly or is there just a certain part that needs to be swapped out?
I found that the going price these days for a fuel pump assembly is around $180 like this one here:
Anyone find a cheaper one lately?
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