Fuel pump doesn't stop running after 2s

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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Fairlane
MegaSquirt Newbie
Posts: 10
Joined: Thu Mar 27, 2008 9:29 am

Fuel pump doesn't stop running after 2s

Post by Fairlane »

Hello!

Fuel pump runs all the time if power is on in ECU. I have wired fuel pump to relay bord and it gives me 12v, even I don't start the engine. So it means that megasquirt keeps grounding the relaybord fuelpump relay, even if it should stop it if I don't crank the engine in 2s. Where's the problem, any ideas?

Thanks!
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dc
MegaSquirt Newbie
Posts: 17
Joined: Sat Nov 25, 2006 4:28 pm
Location: Lake Stevens,WA

Re: Fuel pump doesn't stop running after 2s

Post by dc »

When you test MS on the stim does the fuel pump turn off in 2 seconds
49 Willys panel wagon, 383stroker, Hilborn EFI conversion,msII v3 EDIS, GPIO 4L80E Image
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Fairlane
MegaSquirt Newbie
Posts: 10
Joined: Thu Mar 27, 2008 9:29 am

Re: Fuel pump doesn't stop running after 2s

Post by Fairlane »

Can you tell me where I could see, if the fuel pump is running with stim? I didn't find any indicator light from MegaTune.
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dc
MegaSquirt Newbie
Posts: 17
Joined: Sat Nov 25, 2006 4:28 pm
Location: Lake Stevens,WA

Re: Fuel pump doesn't stop running after 2s

Post by dc »

Mega tune does not have a indicator but a Stimulator such as this does (PMP led) and it allows you to test your Megasquirt for problems and minor testing of your setup . DIY Auto Tune has it, I highly recommend these for any build this falls right next to having a timing light a volt meter
Image
49 Willys panel wagon, 383stroker, Hilborn EFI conversion,msII v3 EDIS, GPIO 4L80E Image
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Fairlane
MegaSquirt Newbie
Posts: 10
Joined: Thu Mar 27, 2008 9:29 am

Re: Fuel pump doesn't stop running after 2s

Post by Fairlane »

Hello!

I tested Mega with stim and PMP LED is on all the time. So it seems that the problem is at the board. Any ideas, where I should start to search the problem?
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: Fuel pump doesn't stop running after 2s

Post by Matt Cramer »

Yes, let me know what board version you have and I'll go over what to check.
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Fairlane
MegaSquirt Newbie
Posts: 10
Joined: Thu Mar 27, 2008 9:29 am

Re: Fuel pump doesn't stop running after 2s

Post by Fairlane »

Mega 2 PCB3.0
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: Fuel pump doesn't stop running after 2s

Post by Matt Cramer »

Here's the circuit to check:

Image

Make sure Q2 isn't fried and D4 has not become shorted to ground.
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Fairlane
MegaSquirt Newbie
Posts: 10
Joined: Thu Mar 27, 2008 9:29 am

Re: Fuel pump doesn't stop running after 2s

Post by Fairlane »

Thanks! I found that one trnsistor was short circuited, and it's works now.
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