Fuel problems
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On The Tree
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Fuel problems My car is a 1996 Formula with mainly bolt ons. It always start up easy in the mornings but once I take it for a spin and come back later it does not start up anymore it will just crank. I have replaced opti, coil, icm, wires, plugs, fuel filter and cleaned the throttle body with no change. I tried spraying some carb cleaner while attempting to start the car and it worked. So I'm guessing fuel problems are the cause but don't know what exactly to check? Fuel pump maybe?
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From: New Hampshire
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TECH Enthusiast
Joined: Aug 2010
Posts: 543
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From: New Hampshire
Your going to have to get the car to not start first, then test the fuel pressure. Gotta get it to act up to find the problem.
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Verdad Gallardo TECH Enthusiast
Joined: Aug 2010
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From: New Hampshire
TECH Enthusiast
Joined: Aug 2010
Posts: 543
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From: New Hampshire
I dont think the pumps faulty because the pump wont even prime. Every time Ive seen a pump fail it will still prime and attempt to work, but cant come close to pushing enough fuel.
If it were me i would be checking to make sure power is getting to the fuel pump after its hot.
It could be the wiring harness going into the pump. I don't know of any easy way to check this, aside from doing the trap door mod to get to the fuel pump https://ls1tech.com/forums/lt1-lt4-m...-mod-pics.html . But that only works if your willing to cut your car.
I hope others will chime in, because I'm not convinced your pump is bad. I also don't know where all you can check for power to the pump other then at the pump its self.
This is only my .02. Just repeating info Ive seen around. Its your car so do what you feel comfortable doing.
If it were me i would be checking to make sure power is getting to the fuel pump after its hot.
It could be the wiring harness going into the pump. I don't know of any easy way to check this, aside from doing the trap door mod to get to the fuel pump https://ls1tech.com/forums/lt1-lt4-m...-mod-pics.html . But that only works if your willing to cut your car.
I hope others will chime in, because I'm not convinced your pump is bad. I also don't know where all you can check for power to the pump other then at the pump its self.
This is only my .02. Just repeating info Ive seen around. Its your car so do what you feel comfortable doing.
TECH Enthusiast
Joined: Aug 2010
Posts: 543
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From: New Hampshire
Well, Ive pretty much exhausted my knowledge of the matter. Try searching the forums using the search tool. There is a lot of useful info on here.
If it were me, Id start checking for power back to the pump, and if you DO have power back to the pump when its hot, then I would suspect the pump to be faulty.
Hope its a simple fix and you figure it out.
Someone else throw some advice at the guy, I've got nothing left in the noodle.
If it were me, Id start checking for power back to the pump, and if you DO have power back to the pump when its hot, then I would suspect the pump to be faulty.
Hope its a simple fix and you figure it out.
Someone else throw some advice at the guy, I've got nothing left in the noodle.
http://shbox.com/1/Dtcs.htm
(click on the OBD-II tab at the bottom of page.)
Does your car still have the evap and EGR? For the O2 sensor and crank position sensor I would check the harness first to see that it is not burned or damaged in any way...
(click on the OBD-II tab at the bottom of page.)
Does your car still have the evap and EGR? For the O2 sensor and crank position sensor I would check the harness first to see that it is not burned or damaged in any way...