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| Fuel pressure regulator (Page 1/2) |
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Andrew561
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APR 11, 10:31 AM
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Hey guys i need help in locating the fuel pressure regulator on my 1988 fiero 2.5 and i cant find it anywhere ive also read that its on the gas tank but im not 100% sure so if someone can help me out with locating it that would be amazing
Thank You!
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Vintage-Nut
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APR 11, 11:36 AM
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I'm a V6 guy but I believe it is in the throttle body itself....
This photo is from a 1988 S10 2.5L L4
Fuel pressure regulator is circled in the red {I added a red arrow}
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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles
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82-T/A [At Work]
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APR 11, 11:51 AM
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| quote | Originally posted by Vintage-Nut:
I'm a V6 guy but I believe it is in the throttle body itself....
This photo is from a 1988 S10 2.5L L4
Fuel pressure regulator is circled in the red {I added a red arrow}
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100%, that is the fuel pressure regulator. It's easier to change out on the newer 87-88 Fieros than it is on the 84-86. But I want to ask... how do you know that you need the fuel pressure regulator replaced. Is this what someone told you? I've never seen one fail... not that they don't occasionally, but it's usually something else, especially in a car this old. These fuel pressure regulators usually last basically forever... and only really ever get replaced because someone is rebuilding the TBI unit for the heck of it.
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Andrew561
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APR 11, 11:56 AM
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| quote | Originally posted by 82-T/A [At Work]:
100%, that is the fuel pressure regulator. It's easier to change out on the newer 87-88 Fieros than it is on the 84-86. But I want to ask... how do you know that you need the fuel pressure regulator replaced. Is this what someone told you? I've never seen one fail... not that they don't occasionally, but it's usually something else, especially in a car this old. These fuel pressure regulators usually last basically forever... and only really ever get replaced because someone is rebuilding the TBI unit for the heck of it. |
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So basically what happens is if you let the car sit for longer than let’s say two hours it takes 30 seconds to start the car but when you just turned off the car and try to turn it back on it starts right back up. I’m in a diesel mechanics class and my teacher said that it could be the fuel pressure regulator because after it sits a while, the fuel can leak back to the fuel tank but I am not sure he(my teacher) seems to be pretty confident for that to be the answer
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1985 Fiero GT
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APR 11, 12:44 PM
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| quote | Originally posted by Andrew561:
So basically what happens is if you let the car sit for longer than let’s say two hours it takes 30 seconds to start the car but when you just turned off the car and try to turn it back on it starts right back up. I’m in a diesel mechanics class and my teacher said that it could be the fuel pressure regulator because after it sits a while, the fuel can leak back to the fuel tank but I am not sure he(my teacher) seems to be pretty confident for that to be the answer |
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The fuel pump replaces that fuel in a matter of a second or 2 at most, my guess would be the fuel pump relay, I don't know if it's different on the 2.5 but on the 2.8 there are 2 seperate things telling the fuel pump to turn on, oil pressure and the ECM via the fuel pump relay, if the relay dies the car still runs, but it needs oil pressure before the fuel turns on, so after sitting the oil drains down and takes a while to build pressure, then turns the fuel pump on, then fuel flows, then it finally starts.
To test this, turn the ignition to on (engine off), you should hear the fuel pump prime for a few seconds, then stop, if you don't, the ECM has no control over the pump, and it is driven by oil pressure only. Diagnose from there.
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Filben
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APR 11, 03:47 PM
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| quote | Originally posted by Andrew561:
So basically what happens is if you let the car sit for longer than let’s say two hours it takes 30 seconds to start the car but when you just turned off the car and try to turn it back on it starts right back up. I’m in a diesel mechanics class and my teacher said that it could be the fuel pressure regulator because after it sits a while, the fuel can leak back to the fuel tank but I am not sure he(my teacher) seems to be pretty confident for that to be the answer |
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Check to see if its spraying fuel when it does its 30 second cranks. If it sprays then I would check if the ignition is going bad(getting heatsoaked after sitting). I would also check to see if its leaking or dripping fuel out of the injector when you shut it off. Those TBIs are easy to rebuild, not sure how cheap anymore, been a long time since I messed with one.
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Andrew561
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APR 17, 11:02 AM
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| quote | Originally posted by Vintage-Nut:
I'm a V6 guy but I believe it is in the throttle body itself....
This photo is from a 1988 S10 2.5L L4
Fuel pressure regulator is circled in the red {I added a red arrow}
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Yes that was The fuel pressure regulator thank you for helping me out
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Andrew561
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APR 17, 11:05 AM
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| quote | Originally posted by Filben:
Check to see if its spraying fuel when it does its 30 second cranks. If it sprays then I would check if the ignition is going bad(getting heatsoaked after sitting). I would also check to see if its leaking or dripping fuel out of the injector when you shut it off. Those TBIs are easy to rebuild, not sure how cheap anymore, been a long time since I messed with one. |
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Yeah i checked everything out and saw that the fuel pressure regulator is bad cuz i saw it dripping fuel from a little hole that it hand in the housing (I’m not sure for a better way to explain that sorry)
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Andrew561
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APR 18, 04:25 PM
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| quote | Originally posted by Filben:
Check to see if its spraying fuel when it does its 30 second cranks. If it sprays then I would check if the ignition is going bad(getting heatsoaked after sitting). I would also check to see if its leaking or dripping fuel out of the injector when you shut it off. Those TBIs are easy to rebuild, not sure how cheap anymore, been a long time since I messed with one. |
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Yeah i checked everything out and saw that the fuel pressure regulator is bad cuz i saw it dripping fuel from a little hole that it hand in the housing (I’m not sure for a better way to explain that sorry)
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82-T/A [At Work]
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APR 18, 07:54 PM
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| quote | Originally posted by Andrew561:
Yeah i checked everything out and saw that the fuel pressure regulator is bad cuz i saw it dripping fuel from a little hole that it hand in the housing (I’m not sure for a better way to explain that sorry) |
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If you haven't already bought it... this comes with everything you need: https://www.rockauto.com/en/moreinfo.php?pk=46922
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