AEROMOTIVE 340LPH STEALTH FUEL PUMP

Mindseye007 · Apr 6, 2022

I had the AEROMOTIVE 340LPH STEALTH FUEL PUMP - installed a few years ago on my 91 LX 5.0 and when you turn the key on the pump keeps running I think because they bypassed the fuel cutoff switch for some reason they could not get power from the fuel cutoff wire so they ran it straight to the fuse box. There is a small little black box resister looking thing in the trunk close to the inertia cut off switch. Isn't the fuel pump supposed to come on for a second and then shut off after you turn the key on?
I have no problems at all the car runs awesome.
The fuel pump just keeps running.
thanks.

Boostedpimp · Apr 6, 2022

The prime period is part of the ECM's logic, past the prime the ECM just needs to see a PIP signal to initiate the pump. PIP signal then passes through the TFI.

Not sure how you have yours wired up but I've had a ECU in the past constantly run the pump and it turned out to be leaking caps on the ECM's board which required a replace/repair of the ECM.

If the ECM is working correctly it would have to see voltage on pins 37 and 57 at the ECM and grounding pin 22 in order to kick the pump on

Mindseye007 · Apr 6, 2022

Boostedpimp said:
The prime period is part of the ECM's logic, past the prime the ECM just needs to see a PIP signal to initiate the pump. PIP signal then passes through the TFI.

Not sure how you have yours wired up but I've had a ECU in the past constantly run the pump and it turned out to be leaking caps on the ECM's board which required a replace/repair of the ECM.

If the ECM is working correctly it would have to see voltage on pins 37 and 57 at the ECM and grounding pin 22 in order to kick the pump on

My car runs sweet lots of power no problems at all.

Mindseye007 · Apr 6, 2022

Boostedpimp said:
The prime period is part of the ECM's logic, past the prime the ECM just needs to see a PIP signal to initiate the pump. PIP signal then passes through the TFI.

Not sure how you have yours wired up but I've had a ECU in the past constantly run the pump and it turned out to be leaking caps on the ECM's board which required a replace/repair of the ECM.

If the ECM is working correctly it would have to see voltage on pins 37 and 57 at the ECM and grounding pin 22 in order to kick the pump on

My car runs sweet lots of power no problems at all with the ecu . The pump just keeps running so weird.

General karthief · Apr 6, 2022

I take it you did not do the install. Why such a big pump?

Mindseye007 · Apr 6, 2022

Future proof for a blower .

Mindseye007 · Apr 6, 2022

And no I did not install it i had the pros at dasilva racing do it.

WhiteCobra95 · Apr 6, 2022

Did they use the factory wiring / relay or did they drop in their own overlay? It sounds like the root cause could be what Boostedpimp suggested, or they've added another circuit where the pump relay is triggered by ignition-on.

Mindseye007 · Apr 6, 2022

WhiteCobra95 said:
Did they use the factory wiring / relay or did they drop in their own overlay? It sounds like the root cause could be what Boostedpimp suggested, or they've added another circuit where the pump relay is triggered by ignition-on.

Yep they added a circuit where the pump relay is triggered by ignition on pretty sure that's how they did it .

General karthief · Apr 6, 2022

That could be a safety issue, smack a wall or rollover would be disastrous.

TOOLOW91 · Apr 7, 2022

Mindseye007 said:
Yep they added a circuit where the pump relay is triggered by ignition on pretty sure that's how they did it .

That’s why it always runs then . All it needs it the trigger from the output of the factory relay .

Mindseye007 · Apr 7, 2022

Which relay the one under the driver's seat?

Boostedpimp · Apr 7, 2022

Mindseye007 said:
Which relay the one under the driver's seat?

Yup

Mindseye007 · Apr 7, 2022

Boostedpimp said:
Yup

Ok thanks for your help.

Monkeybutt2000 · Apr 7, 2022

Some pros huh...

Mindseye007 · Apr 7, 2022

Monkeybutt2000 said:
Some pros huh...

Yep captain Joe and his crew at Dasilva racing do all work on my 91 5.0 they are the foxbody gods and are the best in Ontario canada.

Mindseye007 · Apr 7, 2022

Mindseye007 said:
Yep captain Joe and his crew at Dasilva racing do all work on my 91 5.0 they are the foxbody gods and are the best in Ontario canada.

For all 1979 to 2022 mustang needs these guys are stang gods.

DaSilva Racing

www.dasilvaracing.com

Monkeybutt2000 · Apr 7, 2022

Mindseye007 said:
Yep captain Joe and his crew at Dasilva racing do all work on my 91 5.0 they are the foxbody gods and are the best in Ontario canada.

Guess you didn't pick up the sarcasm.

General karthief · Apr 7, 2022

I remember that name from back in the 'magazine ' days.

Boostedpimp · Apr 7, 2022

General karthief said:
I remember that name from back in the 'magazine ' days.

Yup that was a big name back in the MM&FF days

AEROMOTIVE 340LPH STEALTH FUEL PUMP

Mindseye007

10 years still blowing strong

Boostedpimp

Mindseye007

10 years still blowing strong

Mindseye007

10 years still blowing strong

General karthief

wonder how much it would cost to ship you a pair

Mindseye007

10 years still blowing strong

Mindseye007

10 years still blowing strong

WhiteCobra95

Mindseye007

10 years still blowing strong

General karthief

wonder how much it would cost to ship you a pair

TOOLOW91

If you're the village idiot what's that make me?

Mindseye007

10 years still blowing strong

Boostedpimp

Mindseye007

10 years still blowing strong

Monkeybutt2000

Mustang Master

Mindseye007

10 years still blowing strong

Mindseye007

10 years still blowing strong

DaSilva Racing

Monkeybutt2000

Mustang Master

General karthief

wonder how much it would cost to ship you a pair

Boostedpimp

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wonder how much it would cost to ship you a pair

10 years still blowing strong

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wonder how much it would cost to ship you a pair

If you're the village idiot what's that make me?

10 years still blowing strong

10 years still blowing strong

Mustang Master

10 years still blowing strong

10 years still blowing strong

Mustang Master

wonder how much it would cost to ship you a pair

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