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fuel leak down, at a loss?

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

fuel leak down, at a loss?

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Old 12-10-2009, 09:37 AM
  #11  
FivePointOhh
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well i remember Adder mentioning that BBK is notorious for having leaky regulators when i first bought it years ago. would this test verify a leaky regulator or just leaky injectors? is there a different test for a leaky regulator?
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Old 12-10-2009, 09:49 AM
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I have special gauges I use that connect inline with fuel rails so when I dead headed the pump and it held pressure the only thing left to verify were the inj and reg so when I popped up the inj on the intake and saw none were leaking, only thing left was regulator, I replaced reulator and prob solved, mine would loose all pressure in less than 10 sec and was hard starting if you pulsed the key 5-6 times quickly and cranked it right away it'd start fine, I knew there was a prob cause car came with a FP gauge in a pod mounted inside the car and I could see the prob occur via gauge
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Old 12-10-2009, 10:17 AM
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i ran a line from my reg to the guage to where i can see it on the outside of the engine bay. i was afraid the new FuelPump was takin a crap and i was also making sure i wasnt leaning out at WOT due to lack of FP. well it holds fine once i get it going. but right at first start up, it acts like its loading up because of a laggy and sputtery response after about a minute of running it smooths out and idles just fine. to me this sounds like the fuel is dripping into the cylinders...plugs smell wet with fuel too. i'll attempt the injector test and see where that gets me.

just to confirm, with the tests i've done so far, and after i do the injector test. if i have zero leak down from the injectors, its safe to say the regulator is junk, correct-a-mundo?
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Old 12-10-2009, 10:32 AM
  #14  
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pinch off back at the pump by the filter, and while inj are laying on intake if no leak are seen and as soon as you pinch return off if leakdown stops = safe to say = bad reg but to be sure try test also with inj up and only return pinched off, if leakdown still occurs, and inj don't leak = bad check valve in pump as long as no lines or connections to tank are leaking
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Old 12-10-2009, 10:54 AM
  #15  
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sounds good. will report later of my findings.
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