Stop me before spending parts on a stock miata!
09-26-2013, 03:07 PM
#26
Cpt. Slow
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I'm going to hold off on that check until we verify fuel pressure and/or check again with another ECU. I'm praying for the free ECU, but replacing a $20 fuel pump isn't the worst option either.
On another note, does anyone have experience with a $20 ebay fuel pump?
On another note, does anyone have experience with a $20 ebay fuel pump?
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09-26-2013, 07:42 PM
#28
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I would also check the ground strap and battery terminals while I am at it.
Bad ground will result in very strange sensor outputs, cause motors in pumps etc to run erratically, and create unnecessary painintheassery.
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09-26-2013, 08:48 PM
#29
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Agree with checking/cleaning grounds. I assaulted all underhood grounds on my car with my stainless wheel equipped dremel and some dielectric grease and it was surprisingly effective. Brighter headlights and smoother idle, I kid you not.
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09-27-2013, 01:28 AM
#32
Cpt. Slow
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Very wet. The fuel pump ground is under the soft top, under the carpet, under the metal cover. I'd be surprised if it's rusty under there. I'll look if I'm REALLY bored and nothing else helps.
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09-27-2013, 03:36 PM
#35
Cpt. Slow
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Ha! So Mobius' fuel pressure gauge was apparently hiding in his compression tester box and sitting in my garage this entire time.
Fuel pressure was jumped at the diagnostic box. Gauge was T'd into the fuel rail feed line. It was slightly leaky, but more of a small drip, not a spray (aka: loosing pressure from leak).
Sitting doing nothing it was at 42.5psi.
With a clamped return line, it shot up to 65psi.
How does this sound in terms of pump health?
Fuel pressure was jumped at the diagnostic box. Gauge was T'd into the fuel rail feed line. It was slightly leaky, but more of a small drip, not a spray (aka: loosing pressure from leak).
Sitting doing nothing it was at 42.5psi.
With a clamped return line, it shot up to 65psi.
How does this sound in terms of pump health?
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09-27-2013, 03:48 PM
#36
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Ha! So Mobius' fuel pressure gauge was apparently hiding in his compression tester box and sitting in my garage this entire time.
Fuel pressure was jumped at the diagnostic box. Gauge was T'd into the fuel rail feed line. It was slightly leaky, but more of a small drip, not a spray (aka: loosing pressure from leak).
Sitting doing nothing it was at 42.5psi.
With a clamped return line, it shot up to 65psi.
How does this sound in terms of pump health?
Fuel pressure was jumped at the diagnostic box. Gauge was T'd into the fuel rail feed line. It was slightly leaky, but more of a small drip, not a spray (aka: loosing pressure from leak).
Sitting doing nothing it was at 42.5psi.
With a clamped return line, it shot up to 65psi.
How does this sound in terms of pump health?
That means the regulator has vacuum on it, and is actually reducing the pressure.
Pressure reading with no vacuum on the regulator should be at least 10 psi higher.
Cliffs: I'm pretty convinced at this time that the culprit is the FPR.
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