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#1
07-31-2018, 04:07 PM
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air bubbles in fuel return line
Lots of tiny bubbles show up in the fuel return line on my 84SD when I use clear 5/16 fuel lines and run on diesel from a bottle in the engine compartment. They show up under acceleration. There are only a steady stream of small bubbles at idle. This car has the new Bosch fuel primer of unknown age installed. There are no obvious external leaks in the lines or filters.
What are the possible leak points when the regular tank and lines are taken out of the equation?
__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do. 
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#2
07-31-2018, 05:17 PM
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If you search my post history, I underwent a fairly comprehensive search for bubbles in the line. Plenty of O-rings and crush washers along the way.
__________________
1981 240D 4sp manual. Ivory White.
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#3
07-31-2018, 05:42 PM
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I need some other parts. Is there a possibility that the newer primer could be sucking air anywhere but the crush washer? The primer itself did its job when I changed fuel filters and I have no reason to suspect that it is bad.
__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.
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#4
07-31-2018, 05:46 PM
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Could be the primer handle, crush washers, the lift pump itself, plastic lines, secondary fuel filter housing, IP connections......
__________________
Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!)
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#5
07-31-2018, 10:53 PM
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The Stock Filter Housing also has an air bleed hole in it which keeps some of the Air from getting into the Fuel Injection Pump and onto the Injectors.
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84 300D, 82 Volvo 244Gl Diesel
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#6
08-01-2018, 11:45 AM
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Looks like I need several crush washers and replace the washers where ever there is a joint since there are no apparent external fuel leaks.
__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.
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