 Fuel pump vapor locking |
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| jims914 |
 Mar 30 2023, 02:30 PM
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#1
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Member  Group: Members Posts: 138 Joined: 11-March 11 From: Tempe,AZ Member No.: 12,816 Region Association: Southwest Region 
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Anyone have a problem with vaporing with a three port pump ?
Any solutions ? Thanks Jim |
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| brubou |
Mar 31 2023, 06:46 PM
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#2
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Bruce Bouchard Group: Members Posts: 92 Joined: 29-February 16 From: West Bradford, PA Member No.: 19,716 Region Association: MidAtlantic Region
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Pressurized fuel is going through the tunnel either way, pump in front or pump in back, the system is 29psi.
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| wonkipop |
Mar 31 2023, 07:25 PM
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#3
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Advanced Member Group: Members Posts: 4,757 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille
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QUOTE(brubou @ Mar 31 2023, 06:46 PM)  Pressurized fuel is going through the tunnel either way, pump in front or pump in back, the system is 29psi. not strictly correct. the fuel circuit from the pump to the fuel pressure regulator is pressurized in the pre 75 stock pump scenario. that is restricted to the ring from the pump near the engine to the fpr in the engine bay. the rest of the lines are at lower pressure. the feed line is more or less just weaker suction/gravity feed. flow rather than pressure. the return line is the bleed out of the relief valve in the pump and the fpr. thats why they are two different diameters. the feed line is larger diam by 2mm. different matter in the 75 cars. the feed line from the pump up front to the fpr is at full pressure right through the car. it was also made of an entirely different material. a high pressure nylon plastic. (IMG:style_emoticons/default/beerchug.gif) in the case of a healthy 1.8 L jet the fuel pressure is at 35 lbs. drops to 28 at idle and off throttle. slightly higher than the D jets. |
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Posts in this topic
jims914 Fuel pump vapor locking Mar 30 2023, 02:30 PM
Rrrockhound
Anyone have a problem with vaporing with a three ... Mar 30 2023, 06:13 PM emerygt350 As the original slime insulation falls off the fue... Mar 30 2023, 07:35 PM wonkipop
Anyone have a problem with vaporing with a three ... Mar 31 2023, 01:39 AM brant It’s not the pumps fault
Just the location
Move... Mar 31 2023, 07:26 AM PCH The vapor lock problem disappeared after I went to... Mar 31 2023, 05:10 PM emerygt350 You don't have to redesign the car and send hi... Mar 31 2023, 06:27 PM
brubou
Pressurized fuel is going through the tunnel eit... Mar 31 2023, 08:09 PM wonkipop
[quote name='brubou' post='3068993' date='Mar 31... Apr 1 2023, 12:55 AM jims914 Thanks everyone for your input. Mar 31 2023, 07:28 PM JeffBowlsby Factory fix: https://bowlsby.net/914/Classic/zSB_... Mar 31 2023, 09:52 PM |
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