ok i need help really bad
08-17-2010, 12:58 PM
#1
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ok i need help really bad okay well the shop i took it to said my fuel pressure was like 27 so i bought a walbro pump new sending unit new fuel filter replaced it all and i drove it it was doing good then brought it home let it sit running for a few minutes went RIGHT BACK to the bogging down car rumbling exhaust sounds like camming hit the gas it sounds like its like bogging out then comes back then bogs out then comes back WTF i need some suggestions
08-17-2010, 01:09 PM
#3
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okay well the shop i took it to said my fuel pressure was like 27 so i bought a walbro pump new sending unit new fuel filter replaced it all and i drove it it was doing good then brought it home let it sit running for a few minutes went RIGHT BACK to the bogging down car rumbling exhaust sounds like camming hit the gas it sounds like its like bogging out then comes back then bogs out then comes back WTF i need some suggestions
My suggestion is going back to a stock pump for now until you do A LOT more mods, the stock pump is usually good until around 400 HP then you might wanna consider a bigger one, maybe keep that Walbro around for future use.
08-17-2010, 01:13 PM
#4
Well most likely if your car is still basically stock, the problem is that that Walbro pump is pumping a little too much fuel now and overloading your motor with fuel.
My suggestion is going back to a stock pump for now until you do A LOT more mods, the stock pump is usually good until around 400 HP then you might wanna consider a bigger one, maybe keep that Walbro around for future use.
My suggestion is going back to a stock pump for now until you do A LOT more mods, the stock pump is usually good until around 400 HP then you might wanna consider a bigger one, maybe keep that Walbro around for future use.
The fuel pressure regulator controls how much fuel the injectors see, not the fuel pump. Any extra pressure provided by the higher volume pump simply returns to the tank. A 255lph pump won't cause his issues (assuming his FPR is in good working condition).
OP, you need to do your OWN fuel pressure test to see if the FPR is at fault. Another thing is don't automatically assume its a fuel issue - could be ignition related as well (coil, opti, loose/broken connections, plugs, wires, etc).
08-17-2010, 01:17 PM
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Well most likely if your car is still basically stock, the problem is that that Walbro pump is pumping a little too much fuel now and overloading your motor with fuel.
My suggestion is going back to a stock pump for now until you do A LOT more mods, the stock pump is usually good until around 400 HP then you might wanna consider a bigger one, maybe keep that Walbro around for future use.
My suggestion is going back to a stock pump for now until you do A LOT more mods, the stock pump is usually good until around 400 HP then you might wanna consider a bigger one, maybe keep that Walbro around for future use.
08-17-2010, 01:20 PM
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Not correct.
The fuel pressure regulator controls how much fuel the injectors see, not the fuel pump. Any extra pressure provided by the higher volume pump simply returns to the tank. A 255lph pump won't cause his issues (assuming his FPR is in good working condition).
OP, you need to do your OWN fuel pressure test to see if the FPR is at fault. Another thing is don't automatically assume its a fuel issue - could be ignition related as well (coil, opti, loose/broken connections, plugs, wires, etc).
The fuel pressure regulator controls how much fuel the injectors see, not the fuel pump. Any extra pressure provided by the higher volume pump simply returns to the tank. A 255lph pump won't cause his issues (assuming his FPR is in good working condition).
OP, you need to do your OWN fuel pressure test to see if the FPR is at fault. Another thing is don't automatically assume its a fuel issue - could be ignition related as well (coil, opti, loose/broken connections, plugs, wires, etc).
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08-17-2010, 01:33 PM
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yeah opti is stock as far as i kno i dont think the guy who had it before replaced it as he took crappy care of the car and its got 76,XXX miles on it
08-17-2010, 01:39 PM
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Im with AC, could very well be the FPR, And from experience while changing it make sure you clean out the fuel rail at the same time. Mine where pretty dirty had stuff clogging the rails
08-17-2010, 02:43 PM
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so theres more than one option that it could be ? i guess ill try to replace fuel pressure regulator first and if that dont work i will look into doing opti this car has just about pissed me off more than anything and im about ready to sell this bitch i have spent 1000's of dollars just to get it to run constantly something going wrong
08-17-2010, 02:47 PM
#13
Don't throw parts at the car. You need to be smart about it and do the proper diagnostics. Go get a fuel pressure test gauge and do some tests. We can guide you along the way.
In the meantime, pull the vacuum line off of the regulator, then prime the pump a few times (or if you're by yourself apply 12v+ to the fuel pump prime connector) and see if any fuel comes out of the fitting on the reg. If it does, the regulator is bad.
In the meantime, pull the vacuum line off of the regulator, then prime the pump a few times (or if you're by yourself apply 12v+ to the fuel pump prime connector) and see if any fuel comes out of the fitting on the reg. If it does, the regulator is bad.
08-17-2010, 02:52 PM
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Don't throw parts at the car. You need to be smart about it and do the proper diagnostics. Go get a fuel pressure test gauge and do some tests. We can guide you along the way.
In the meantime, pull the vacuum line off of the regulator, then prime the pump a few times (or if you're by yourself apply 12v+ to the fuel pump prime connector) and see if any fuel comes out of the fitting on the reg. If it does, the regulator is bad.
In the meantime, pull the vacuum line off of the regulator, then prime the pump a few times (or if you're by yourself apply 12v+ to the fuel pump prime connector) and see if any fuel comes out of the fitting on the reg. If it does, the regulator is bad.
this couldnt be a back pressure issue cause i dont have a muffler i have exhaust back just tubes though no mufflers would back pressure cause any of this i dont think so but worth asking
08-17-2010, 02:59 PM
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Not correct.
The fuel pressure regulator controls how much fuel the injectors see, not the fuel pump. Any extra pressure provided by the higher volume pump simply returns to the tank. A 255lph pump won't cause his issues (assuming his FPR is in good working condition).
OP, you need to do your OWN fuel pressure test to see if the FPR is at fault. Another thing is don't automatically assume its a fuel issue - could be ignition related as well (coil, opti, loose/broken connections, plugs, wires, etc).
The fuel pressure regulator controls how much fuel the injectors see, not the fuel pump. Any extra pressure provided by the higher volume pump simply returns to the tank. A 255lph pump won't cause his issues (assuming his FPR is in good working condition).
OP, you need to do your OWN fuel pressure test to see if the FPR is at fault. Another thing is don't automatically assume its a fuel issue - could be ignition related as well (coil, opti, loose/broken connections, plugs, wires, etc).
08-17-2010, 03:01 PM
#17
Don't throw parts at the car. You need to be smart about it and do the proper diagnostics. Go get a fuel pressure test gauge and do some tests. We can guide you along the way.
In the meantime, pull the vacuum line off of the regulator, then prime the pump a few times (or if you're by yourself apply 12v+ to the fuel pump prime connector) and see if any fuel comes out of the fitting on the reg. If it does, the regulator is bad.
In the meantime, pull the vacuum line off of the regulator, then prime the pump a few times (or if you're by yourself apply 12v+ to the fuel pump prime connector) and see if any fuel comes out of the fitting on the reg. If it does, the regulator is bad.
08-17-2010, 06:05 PM
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Follow the recommendation of checking the FPR. Pulling the vacuum line is free, and throwing parts at it is expensive. My 85 did the exact same thing when the FPR went out (TPI, about the same pressure).