 Stuck Fuel pressure regulator? |
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| pete000 |
 Jun 30 2015, 04:20 PM
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#1
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Senior Member  Group: Members Posts: 1,885 Joined: 23-August 10 From: Bradenton Florida Member No.: 12,094 Region Association: South East States  |
74 1.8 L-Jet
Has any one ever had a fuel pressure regulator get stuck from sitting dry? My car has been on jack stands for 4 years. and I finally got all the fuel lines back in. No fuel was going to the fuel rails. I tested the pump and its pumping just fine but no fuel seems to get past the pressure regulator. I took it apart and soaked it in gas and bench tested it with the pump and it seems to be flowing good now. I also checked the cold start valve, fuel rails, and they are not blocked. Have to put it all back in and see. Seems like it just got stuck and would not allow fuel flow. Possible? |
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| jcd914 |
Jun 30 2015, 04:46 PM
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#2
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
Fuel Pressure Regulator is at the end of the fuel loop and would not stop fuel from getting to the injectors.
Fuel goes from tank to pump to injectors to press reg to tank. If it were stuck close fuel pressure would max out at what ever the pump could generate (on my explorer that about 100psi). If it were stuck open the fuel pressure would be very low. Jim |
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| jim_hoyland |
Jun 30 2015, 05:52 PM
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#3
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Get that VIN ? Group: Members Posts: 9,263 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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My L-Jet has an in-line fuel pressure gauge mounted by the CSV. It really helps in diagnosing l-Jet issues when the motor quits all of a sudden. If engine quits and fuel pressure gage still reads 30 or so, the problem is not fuel related. If it dies and fuel pressure is zero, then it,s most likely a dual relay connection, ground or pump issue.
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| Dave_Darling |
Jun 30 2015, 06:38 PM
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#4
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914 Idiot Group: Members Posts: 14,981 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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If you hook up the FPR backwards, you'll have very high fuel pressure because the regulator will act as a plug in the line. BTDT.
--DD |
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| McMark |
Jun 30 2015, 09:57 PM
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#5
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
What Dave said.
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| pete000 |
Jun 30 2015, 10:08 PM
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#6
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Senior Member Group: Members Posts: 1,885 Joined: 23-August 10 From: Bradenton Florida Member No.: 12,094 Region Association: South East States |
I thought I might have it backwards, but it wasn't. It is correct.
Would it take time to pump out all the air in the lines? I didn't run the pump for very long. I was tripping it on by using the air flapper. I will try to fun the pump with the line open at the end of the loop to get all the air out. |
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| McMark |
Jul 1 2015, 01:23 PM
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#7
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Takes 20-45seconds to get fuel through, and then another 60s to purge all the air. Then check for leaks.
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| worn |
Jul 1 2015, 01:37 PM
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#8
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can't remember Group: Members Posts: 3,148 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(pete000 @ Jun 30 2015, 03:20 PM)  74 1.8 L-Jet Has any one ever had a fuel pressure regulator get stuck from sitting dry? My car has been on jack stands for 4 years. and I finally got all the fuel lines back in. No fuel was going to the fuel rails. I tested the pump and its pumping just fine but no fuel seems to get past the pressure regulator. I took it apart and soaked it in gas and bench tested it with the pump and it seems to be flowing good now. I also checked the cold start valve, fuel rails, and they are not blocked. Have to put it all back in and see. Seems like it just got stuck and would not allow fuel flow. Possible? I got a car that had sat for more than a decade. Drove it home from Baltimore with 90 PSI straight from the pump. It ran very poorly and scared the crap out of me as the trucks passed me on the Pennsylvania turnpike. Yeah, they can get stuck. I freed it up, but not trusting it, replaced it nonetheless. The gas gauge did the same thing. Reading down to half full. It fixed itself, but not without me having to frequently fill a car to be on the safe side with an engine that didn't want to start. Of course the do gear had come loose too... (IMG:style_emoticons/default/headbang.gif) |
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| JeffBowlsby |
Jul 1 2015, 01:57 PM
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#9
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914 Wiring Harnesses Group: Members Posts: 8,480 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Sounds more like you switched your fuel supply/return lines where they enter the engine bay. Common mistake.
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