trance42 Posted August 13, 2007 Report Share Posted August 13, 2007 My car is back together with the orange injectors. Started up just fine. Drove it down the road. came back to the house andturned it off. Tried to start the car and it wouldn't start. plenty of fuel came out of the rail when i pushed on the valve. Took theorange injectors out put the rc 750s back in. it started! Drove it down the road. Came back to the house and turned it off. Wentback out a few min later to start it and it would not start. Barely any fuel came out of the valve in the fuel rail this time. This isdriving me nuts. What is going on? Fuel filter? The pump sounds like it is turning on. and yes i put gas in the tank. Link to comment Share on other sites More sharing options...
erikv11 Posted August 13, 2007 Report Share Posted August 13, 2007 you should hear the pump for a few seconds every time you turn on the key, try turning it on and off a few times and see if the pump hums every time. When my car's fuel pump went out, it would hum most of the time on the key turn, but would never pump fuel while cranking. Then it stopped pumping even when turning the key on.If you suspect the filter is clogged, there is another Schrader valve under the car, before the fuel filter. If you have pressure before but not after, then the filter is clogged. But I think a clogged filter is pretty rare.if you would have said the car always has pressure at the rail, I would have guessed fuel injector relay, the gray one up at the fan shroud.fuel pressure regulator? Link to comment Share on other sites More sharing options...
trance42 Posted August 13, 2007 Author Report Share Posted August 13, 2007 i have a walboro. do they go out pretty often? the fuel relay is a possibility. is there any way to test that. volt meter on the injectors? no after market fpr. Link to comment Share on other sites More sharing options...
md850 Posted August 13, 2007 Report Share Posted August 13, 2007 i have a walboro. do they go out pretty often? the fuel relay is a possibility. is there any way to test that. volt meter on the injectors? no after market fpr.check your fuel pressure from the shrader valve on the fuel rail, should be about 40-43 psi, remove fuel pump relay and remove the cover and check the soldering, redo if necessary,and check the fuel injector relay for operation.you should hear the idle valve humming. if you dont have a pressure guage you can connect a hose to the return line on the regulator and put the other end into a bucket to at least check for flow.sounds like fuel pump relay though. :( Link to comment Share on other sites More sharing options...
trance42 Posted August 13, 2007 Author Report Share Posted August 13, 2007 check your fuel pressure from the shrader valve on the fuel rail, should be about 40-43 psi, remove fuel pump relay and remove the cover and check the soldering, redo if necessary,and check the fuel injector relay for operation.you should hear the idle valve humming. if you dont have a pressure guage you can connect a hose to the return line on the regulator and put the other end into a bucket to at least check for flow.sounds like fuel pump relay though. i replaced the fuel pump relay not so long ago. i depressed the shrader valve after replacing the fuel filter and i get loots of fuel. i took the rail back off and poured out the gas and changed the injectors back to the orange ones. started up like a champ. turned it off and wouldn't start. just cranks for ever. it has to be something with the fuel rail or pressure regulator. i checked that i had spark to everything and i did. i had power to the injectors. power at the injector relay. the fuel pump comes on when you turn teh key on. i don't know what to do. Is teh fuel pump relay the red relay under the dash? it doesnt seem like that would be the problem because it runs great when i take the rail apart Link to comment Share on other sites More sharing options...
erikv11 Posted August 13, 2007 Report Share Posted August 13, 2007 Is teh fuel pump relay the red relay under the dash? it doesnt seem like that would be the problem because it runs great when i take the rail apartthe fuel pump relay is under the fuse compartment, in the engine bay. You have to unscrew the four torx screws and lift out the fuse compartment. The fuel pump relay is red it says "103" on top.But I agree with you it sort of sounds like the relay is fine. On the other hand when relays crap out, they often go intermittent at first. You can check the fuel pump relay something like this: open the cover to the fuel pump. Get an odometer in there: do you have voltage to the fuel pump (pink wire) when the car is cranking but not starting? I know needs two people to check. Or run some wires up to the driver's seat and hold the odometer there, that is how I did it. Just be careful about fuel and spark etc.I don't know how the fuel pressure regulator works but I am still suspecting it. Also is your IAC recently cleaned? just a thought. Link to comment Share on other sites More sharing options...
trance42 Posted August 14, 2007 Author Report Share Posted August 14, 2007 I don't know how the fuel pressure regulator works but I am still suspecting it. Also is your IAC recently cleaned? just a thought.What is an iac? i am going to put another fuel pressure regulator on the rail tomorrow and see what happens. Link to comment Share on other sites More sharing options...
Gioseppe Posted August 14, 2007 Report Share Posted August 14, 2007 iac = idle air controller, not that related really....if you get a fuel pressure guage then it will be much easier to diagnose this condition....... hell even a tire pressure guage that you don't care about will work! Link to comment Share on other sites More sharing options...
erikv11 Posted August 14, 2007 Report Share Posted August 14, 2007 if he's got fuel and spark and compression then sure, couldn't it be the IAC or even the throttle position sensor, cam sensor etc.? Like I said in my first post it sounds more like maybe the injector relay (he's checked that now) or the fuel pressure regulator, but it seems he should consider it if the fuel supply turns out ok. Link to comment Share on other sites More sharing options...
Guest Guest Posted August 14, 2007 Report Share Posted August 14, 2007 if you get a fuel pressure guage then it will be much easier to diagnose this condition....... hell even a tire pressure guage that you don't care about will work!Like I said in my first post it sounds more like maybe the injector relay (he's checked that now) or the fuel pressure regulator, but it seems he should consider it if the fuel supply turns out ok.Ill get a guage for the fuel pressure today and try an old fpr i have. Link to comment Share on other sites More sharing options...
trance42 Posted August 16, 2007 Author Report Share Posted August 16, 2007 i tried the old fpr and nothing. I bought a fuel pressure gauge and when i turn the key to on the pressure raises to 35 psi and falls to about 15 psi. Link to comment Share on other sites More sharing options...
md850 Posted August 16, 2007 Report Share Posted August 16, 2007 i tried the old fpr and nothing. I bought a fuel pressure gauge and when i turn the key to on the pressure raises to 35 psi and falls to about 15 psi.man 15 psi aint enough to piss through the injectors, you should have about 43-45 psi, check the post by bagodoosh about the rate of pressure falloff. sounds like either fpr or pump. clamp the return line and check the pressure or clamp the return line with a vice grip and try to start, you'll know if it is the pump or fpr. Link to comment Share on other sites More sharing options...
trance42 Posted August 17, 2007 Author Report Share Posted August 17, 2007 man 15 psi aint enough to piss through the injectors, you should have about 43-45 psi, check the post by bagodoosh about the rate of pressure falloff. sounds like either fpr or pump. clamp the return line and check the pressure or clamp the return line with a vice grip and try to start, you'll know if it is the pump or fpr.i tried to clamp the hose. same result. i tried the stock pump. same result. while the car is cranking i am getting 30 psi. this is the craziest no sense problem i have ever had. what does pouring out the fuel from the rail have to do with anything to make the car start. it drives perfectly when its going. i am about to put it in neutral and roll it off a cliff. Link to comment Share on other sites More sharing options...
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