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Re-Pressurize Fuel System

 
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Philly924S  



Joined: 20 Nov 2016
Posts: 12
Location: Philly Burbs

PostPosted: Thu Dec 08, 2016 7:42 am    Post subject: Re-Pressurize Fuel System Reply with quote

Question: Should the fuel pump run when the ignition key is in the “on” position?

Background: 1988 924 S. I am finishing my first project on this car: replacing small vacuum lines, replacing hoses under intake manifold (new gaskets), injectors out to WichHunter, new cap, rotor (just finished cutting it off with a dremel, and I’m off to Homie for new metric bolts), plugs, wires, replace the AOS seals and slotted the dipstick bracket. All in all, a nice “get to know ya” project.

I put the battery back in the car to pressurize the fuel system (to check for leaks) , turn the key to “on” and nothing from the fuel pump. Everything else seems normal, door open bell, dash lights come on, tack bounce.

I did not remove the DME relay before reconnecting the battery. Frankly, it’s in an awful location.

Do I need to engage the starter (crank the engine) to get the fuel pump running? I recall that I put the ignition key in the 0 position (everything off), Position 1 is “on”, Position 2 is “start,” after the car starts the key springs back to Position 1. Is that correct?

Thanks,
Alan
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11332
Location: PacNW

PostPosted: Thu Dec 08, 2016 3:36 pm    Post subject: Reply with quote

Fuel pump doesn't run with key in "on" position unless the engine is running.

If you build a short jumper wire, you can run the fuel pump using the DME relay socket under the dash. See Clark's for details.
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Philly924S  



Joined: 20 Nov 2016
Posts: 12
Location: Philly Burbs

PostPosted: Thu Dec 08, 2016 11:30 pm    Post subject: Reply with quote

Thanks, Rasta, I will try the Jumper today!
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Philly924S  



Joined: 20 Nov 2016
Posts: 12
Location: Philly Burbs

PostPosted: Fri Dec 09, 2016 9:04 am    Post subject: Re Pressurise Fuel System Update... Good News, Bad News Reply with quote

I built a DME jumper per Clark's (Thanks Rasta) and managed to remove the DME and insert the jumper leads (that's a tight spot-and my car is currently 15" in the air on 4 jack stands). The fuel pump started running and...all connections are tight, no leaks.
The fuel lines are another story. The high pressure delivery line is weeping fuel. When I started this project I noticed the fuel line hoses looked to be in poor condition. I could see cracks in the hoses, but they were intact. I suppose moving them around to remove and replace the Intake Manifold caused/contributed to the failure. I'm probably lucky, at least I saw it before I started driving. Avoided the 924 flambe.
Tomorrow I will source and buy correct length lines. And I thought I would be driving by the weekend.
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Rasta Monsta  



Joined: 12 Jul 2006
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Location: PacNW

PostPosted: Fri Dec 09, 2016 10:00 am    Post subject: Reply with quote

Call Travis at Rennbay, he has a nice kit.
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Philly924S  



Joined: 20 Nov 2016
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Location: Philly Burbs

PostPosted: Fri Dec 09, 2016 10:54 am    Post subject: Reply with quote

Great, thanks
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