How to build fuel pressure without cranking engine??
06-03-2002, 06:45 PM
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How to build fuel pressure without cranking engine??
I would like to pressurize my fuel system without cranking the engine. Any thoughts on how to do this? Is there an easy way to activate the fuel pump...maybe at the relay?
I recently removed the fuel rail, and I am upgrading to stainless fuel lines. Since there is a lot of air in the system, I want to "pre-pressurize" the fuel system before cranking the engine. I figure that this will help minimize the dry friction before the engine starts.
I recently removed the fuel rail, and I am upgrading to stainless fuel lines. Since there is a lot of air in the system, I want to "pre-pressurize" the fuel system before cranking the engine. I figure that this will help minimize the dry friction before the engine starts.
06-03-2002, 08:31 PM
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For some reason I thought that the fuel pump would only activate when cranking the engine. However, this doesn't make sense since a constant supply of fuel is needed while the engine is running (ignition key in "ON").
I was cranking the engine last week with the DME relay out to build oil pressure. That explains why I didn't have fuel all over the place. I believe that the relay that controls the fuel pump is part of the DME relay.
I was cranking the engine last week with the DME relay out to build oil pressure. That explains why I didn't have fuel all over the place. I believe that the relay that controls the fuel pump is part of the DME relay.
06-03-2002, 09:08 PM
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they are part of the same circuit, the DME controls the fuel pump.
they are part of the same circuit, the DME controls the fuel pump.
06-04-2002, 03:51 PM
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[quote]Originally posted by tt9714:
<strong>I would like to pressurize my fuel system without cranking the engine. Any thoughts on how to do this? Is there an easy way to activate the fuel pump...maybe at the relay?</strong><hr></blockquote>
Remove the DME relay, bridge terminals 30 and 87b together using 16-20 gauge wire with a flat blade-type connector at each end, the fuel pump will run.
[quote]<strong>I recently removed the fuel rail, and I am upgrading to stainless fuel lines. Since there is a lot of air in the system, I want to "pre-pressurize" the fuel system before cranking the engine. I figure that this will help minimize the dry friction before the engine starts. </strong><hr></blockquote>
There's no need to do this that I am aware of. You're looking at 10 or so revolutions to pressurize a dry system - should not harm anything. Oil is the primary lubricant.
Good Luck!
<strong>I would like to pressurize my fuel system without cranking the engine. Any thoughts on how to do this? Is there an easy way to activate the fuel pump...maybe at the relay?</strong><hr></blockquote>
Remove the DME relay, bridge terminals 30 and 87b together using 16-20 gauge wire with a flat blade-type connector at each end, the fuel pump will run.
[quote]<strong>I recently removed the fuel rail, and I am upgrading to stainless fuel lines. Since there is a lot of air in the system, I want to "pre-pressurize" the fuel system before cranking the engine. I figure that this will help minimize the dry friction before the engine starts. </strong><hr></blockquote>
There's no need to do this that I am aware of. You're looking at 10 or so revolutions to pressurize a dry system - should not harm anything. Oil is the primary lubricant.
Good Luck!
