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EEC IV fuel pump output voltage. 

 

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 Post subject: EEC IV fuel pump output voltage.
Posted: Sat Jan 01, 2011 5:14 pm 
Oompa Loompa
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Joined: 4th Mar 2008

Ride: 289 Windsor & C 4

Location: Mornington
VIC, Australia

Can you shed any light as to why I only have 6.5 volts on the fuel pump output to trigger the relay?
I have tried another EEC same issue. Is it a wiring problem or could it be the J3 chip.
Does the EEC need to see some thing particular to trigger the fuel pump. Signal from the TFI or something else.
If I bridge the relay the pumps run fine and the engine starts no worries.

The engine is a 289 with EB EFI fitted. It is not in a Ford though.

Any thoughts? Open to suggestions.

 

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 Post subject: Re: EEC IV fuel pump output voltage.
Posted: Sat Jan 01, 2011 6:38 pm 
Getting Side Ways
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5V is used on sensers from EEC...

 

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 Post subject: Re: EEC IV fuel pump output voltage.
Posted: Sat Jan 01, 2011 6:40 pm 
Getting Side Ways
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have you tried removing the J3 chip?

the fuel pump wire from the ecu should switch to ground when the engine is running, ie 0 volts.
as it switches the gnd side of the fuel pump relay

how do you have the fuel pump relay wired up, ie pin 85 should go to the fuel pump wire on the ecu and 86 should go to an ignition switched 12v source
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 Post subject: Re: EEC IV fuel pump output voltage.
Posted: Sat Jan 01, 2011 7:00 pm 
Oompa Loompa
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Posts: 23

Joined: 4th Mar 2008

Ride: 289 Windsor & C 4

Location: Mornington
VIC, Australia

66 coupe wrote:
have you tried removing the J3 chip?

the fuel pump wire from the ecu should switch to ground when the engine is running, ie 0 volts.
as it switches the gnd side of the fuel pump relay

how do you have the fuel pump relay wired up, ie pin 85 should go to the fuel pump wire on the ecu and 86 should go to an ignition switched 12v source


Cheers. I now realize I have the relay wired wrong. It will be a simple fix.

 

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289hilux
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 Post subject: Re: EEC IV fuel pump output voltage.
Posted: Sat Jan 01, 2011 8:13 pm 
Oompa Loompa
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Posts: 23

Joined: 4th Mar 2008

Ride: 289 Windsor & C 4

Location: Mornington
VIC, Australia

289hilux wrote:
66 coupe wrote:
have you tried removing the J3 chip?

the fuel pump wire from the ecu should switch to ground when the engine is running, ie 0 volts.
as it switches the gnd side of the fuel pump relay

how do you have the fuel pump relay wired up, ie pin 85 should go to the fuel pump wire on the ecu and 86 should go to an ignition switched 12v source


Cheers. I now realize I have the relay wired wrong. It will be a simple fix.



Just rewired the relay. Works as it should now.
Thanks for the tip.

 

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289hilux
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 Post subject: Re: EEC IV fuel pump output voltage.
Posted: Sat Jan 01, 2011 8:14 pm 
Getting Side Ways
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Age: 38

Posts: 1319

Joined: 5th Nov 2004

Ride: 66 Coupe

Location: Perth
WA, Australia

no probs :)
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