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Fasteddie313 · Joined: 29 Sep 2013 Posts: 2595 Location: MI

After you run the fuel pump it will keep fuel pressure for quite a while (residual pressure) and will sputter if you try to start it on only what residual pressure is left..

Just because you have some pressure in your fuel lines doesn’t mean that you have anywhere near what pressure the fuel pump runs at..
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80 Turbo - Slightly Modified

924RACR · Posted: Sun Jan 09, 2022 9:02 am Post subject:

Power from the battery DIRECT to terminal #15 on the coil.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

BWW · Joined: 21 Sep 2021 Posts: 60 Location: Idaho, USA

I tried your suggestion, Vaughan. I ran a wire directly from the batter to 15 then jumped across 30 and 50. Sadly, same result. Argh! I'm eager to get this thing running So close yet so far away.

BWW · Joined: 21 Sep 2021 Posts: 60 Location: Idaho, USA

Fasteddie, I have a fuel pressure gauge tied in, and when I crank it maxes out the gauge. So assume this would be sufficient pressure. Am I right about this?

BWW · Joined: 21 Sep 2021 Posts: 60 Location: Idaho, USA

I went out to try to do some more diagnostics and discovered that my fuel pressure is gone again. Jumped across the fuel pump relay and the pump kicked on. I don't know why it keeps coming and going, but there seems to be no rhyme or reason to it. One day I have it and the next day I don't. Then it reappears again. Why??? Eliza's been helping a lot over email, but other ideas would be more than welcome. Thanks for all the guidance so far.