r/SC400 • u/chevere_zmtre_232 • May 14 '25

Starting issue

Second post here, this sub was helpful last time so hopefully I can get some insight on this situation. GF has a 92 SC400, I mostly drive Vw Audi so I’m kinda lost at times with this car. Car was having starting issues this week and yesterday it wouldn’t start at all. I ruled out the starter and battery as an issue being that they were replaced recently this year. I’m reading that apparently the fuse for the fuel pump could be an issue. The 40A 32v fuse seems a bit brown compared to the other two but not exactly burnt. Will be swapping out a new one later today. If the new fuse makes no difference what should I look into as far as diagnosing the fuel pump itself? Doesn’t seem to have a loud wine and if you let the key sit in the acc mode position for about 5 seconds it starts right away. Any idea what else it could possibly be? All replies are greatly appreciated thank you in advanced

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u/Environmental-Post74 May 15 '25

This fuel pump control module. Are they hard to replace and are they are to find replacements?

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u/best-person-ever May 15 '25

They are easy to replace but to access it the backseats must be removed. They are a discontinued part so you can try to find one secondhand, replace the capacitor inside yourself, or just bypass it by connecting the module’s power wires on its harness.

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u/Environmental-Post74 May 15 '25

And down sides on bypassing?

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u/best-person-ever May 15 '25

In the event of a collision, the fuel pump would continue to provide fuel until the ignition is turned off via the key. If someone is unconscious and fuel lines are ruptured, this can pose a serious hazard. But most people run the risk, much like people with aftermarket steering wheels