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11-20-2015, 06:51 PM #1
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No fuel pressure...but pumping fuel
So when I have a gauge hooked up and use the prime cord the pump runs and I hear fuel moving at the rail, but no pressure builds. It does this with an aeromotive adj regulator and the stocker. Maybe the pump is bad? Everything on the pump is hooked up correctly. Car was running on jack stands, I shut it off to put it on the ground and now it won't run. It fires periodically, but won't idle. Here's a vid of the prime with a gauge.
Sent from my iPhone using TapatalkLast edited by 9t4zee28; 11-21-2015 at 03:42 PM.
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1994 Camaro M6 Z28. 355 forged 24x LE2 LT4 H/I, LE cam, supporting mods, LT's ypipe, etc
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11-20-2015, 07:03 PM #2
Long Live the Opti
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have you tried priming with the fuel line opened somewhere, to verify actual flow? Back of the rail, under the car, at the filter, just try it once that way?
Originally Posted by Ryan Stout
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11-20-2015, 07:25 PM #3
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Yeah I tried it with the fuel line off the rail and it pumps fuel out
Sent from my iPhone using Tapatalk2007 Silverado CC Z71 VortecMax
1994 Camaro M6 Z28. 355 forged 24x LE2 LT4 H/I, LE cam, supporting mods, LT's ypipe, etc
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11-20-2015, 09:27 PM #4
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maybe you could try pinching the return line off while priming it and see if it would try to build pressure then....if it built plenty of pressure at that point blame the regulator, if it builds anything under like 60 i would say somethings up with the pump
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11-20-2015, 09:59 PM #5
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I'll try that in the morning, then look at the pump. I had the stock and the aftermarket adj on it and both don't build pressure, I'm leaning toward pump at this point. Crazy thing is it was idling fine, I shut it off for 2 mins tops and it restarted idling real rough and low rpm then died. Now, if I let it sit for a while, it'll hit, then die immediately
Sent from my iPhone using Tapatalk2007 Silverado CC Z71 VortecMax
1994 Camaro M6 Z28. 355 forged 24x LE2 LT4 H/I, LE cam, supporting mods, LT's ypipe, etc
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11-20-2015, 10:50 PM #6
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Did you take the Schrader valve out
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11-21-2015, 01:44 PM #7
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Got fuel pressure...faulty gauge
...got new ICM and still no idling, must be the opti...here's a video of it "running"
Sent from my iPhone using Tapatalk2007 Silverado CC Z71 VortecMax
1994 Camaro M6 Z28. 355 forged 24x LE2 LT4 H/I, LE cam, supporting mods, LT's ypipe, etc
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11-21-2015, 04:43 PM #8
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There are two different types of gauges. A "test pressure gauge" has a pin that depresses the core of the Schrader valve, allowing pressure to reach the gauge. A plain "gauge" does not have the pin, and requires that the valve core be removed, as tleed pointed out above.
SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.
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11-21-2015, 08:02 PM #9
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The pin had fallen out of the fitting and I didn't know it, my plugs are black and gas filled now, so I'll try new plugs before I swap opti's
Sent from my iPhone using Tapatalk2007 Silverado CC Z71 VortecMax
1994 Camaro M6 Z28. 355 forged 24x LE2 LT4 H/I, LE cam, supporting mods, LT's ypipe, etc
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