Injectors firing???
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Joined: Dec 2005
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From: Utica In
Injectors firing???
Can low fuel pressure cause a no start condition? I have a 89 that is not firing the injectors. I have a good ground and 12 volts at the injectors tested with fluke. I only have ~20 psi fuel pressure with a new pump and new fuel filter. The fuel pressure regulator is blown (I will replace this week) but I was surprised that it still would not start. The car would start with starter fluid but die because the injectors not firing. Do the injectors need min pressure to operate? If so what pressure? Is there something else going on? Thoughts?
Le Mans Master
Joined: Nov 2009
Posts: 6,882
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From: Bangkok, Thailand
I don't think they need a minimum to "fire" but if the pressure is that low you may not get enough gas out of them to get a lightable mixture. On my 91 you can touch them when the engine is running and feel them "click" as they fire. You could have someone crank it over and see if you feel the click. I'm pretty sure there is a separate fuse for the injector circuit. If the fuse is blown that would kill it right there.
Le Mans Master
Joined: Jul 2007
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From: No HOA, New Hampshire
Cruise-In X Veteran
St. Jude Donor '09
You have 2 of the 3 things that an engine needs to run. If the injectors are working with 20# the mixture is too lean to fire. You have already stated that the regulator is toast, you have your answer there.
Team Owner
Joined: Jul 2004
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From: Hartford WI
Can low fuel pressure cause a no start condition? I have a 89 that is not firing the injectors. I have a good ground and 12 volts at the injectors tested with fluke. I only have ~20 psi fuel pressure with a new pump and new fuel filter. The fuel pressure regulator is blown (I will replace this week) but I was surprised that it still would not start. The car would start with starter fluid but die because the injectors not firing. Do the injectors need min pressure to operate? If so what pressure? Is there something else going on? Thoughts?
