intermittent no start, fuel pump or main relay how to tell?
 

My car has in intermittent no start, wait a minute and it would usually start. It would basically start and then putter off and die. It's not getting any fuel pressure and only starting off the fuel pressure that was in there from the last time I shut it off. Then it putts down and dies and won't start again.

So I pulled the main relay and popped the cover. No obviously screwed up solder jobs but I resoldered them anyway. Is that all you need to do is pop the cover? Or do you need to pull it apart more? I tested it per the manual before soldering , but it tested out fine (the car also started to run again though)

I have a walbro I'm going to install tonight cause I've been needing to install it for a couple weeks now.

So how do I know what was causing it in the first place? Main relay or fuel pump starting to go? I hate just throwing new parts in a car without knowing they the parts going bad.

Complex need not reply

Re: intermittent no start, fuel pump or main relay how to tell?
 

Have you checked for voltage at the fuel pump?

Re: intermittent no start, fuel pump or main relay how to tell?
 

the car is running fine right now, so of course there is voltage at the pump.

That's the problem, everything works and checks out fine once I get the car back to the garage.

So when a fuel pump goes is it intermittent or does it just die one day?

Or when the relay goes is it intermittent or does it just die one day?

Is there any way to confirm which one is acting up? That is pretty much my main question.
I'm leaning towards main relay. I just hate to throw parts at it and assume its' fixed then I start beating again and it leans out and takes my pistons with it.

Re: intermittent no start, fuel pump or main relay how to tell?
 

check teh alternator.

Re: intermittent no start, fuel pump or main relay how to tell?
 

main relays that work fine tend to die in hotter weather, esp if a car sits out in the sun...
you probably have the new fuel pump in by now you need it either way. I am sure that was the problem. :y

Re: intermittent no start, fuel pump or main relay how to tell?
 

didn't get the pump in, I'm a failure :3

But I did beat a gsr with a jackson supercharger. That felt pretty nice

Re: intermittent no start, fuel pump or main relay how to tell?
 

If the car shuts off again beat on the dash near the location of where the relay is mounted (with the key on) and if the pump comes back on theres your problem. That ghetto ass trick has gotten me home on multiple occasions

Re: intermittent no start, fuel pump or main relay how to tell?
 

Re: intermittent no start, fuel pump or main relay how to tell?
 

Yeah it hasn't happened again since I re-flowed the solder. That makes sense that it would be the one going intermittently also.

And I finally got the walbro in, dropped my redline/max boost afr's down to low 10's high 9's. Time for a retune.