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Been trying to get original equipment A4 engine going for some time, just now have had chance to trace problem. I now think it's the fuel pump. Ran well until early this year. I think.
First, I found the crud shown in the first image from fuel tank, purged by a primer bulb at location of bulkhead filter. Pumped until it was gone; cannot remove fuel pickup from tank - "head" in pickup is bigger O.D. than bore in welded flange. Purged until no more contaminants. Waited a month for tank to settle, purged, no new "red goo." First attachment is clear plastic container with some fuel, and red goo contaminant. Whatever it is, it doesn't mix with gas. I figure whatever it is might have trashed the fuel pump.
2nd image shows current fuel pump, 3rd image is shot of fuel pump from rear of engine, also showing the oil pressure switch (in yellow "circle"), I think.
I've setup up the fuel line path with and without filter in place, and used priming bulb in-line to pressurize and prime line in all trials until bulb stayed solid. No start - with starting fluid, I get a burst of cranking speed, a few pops, started once for approx. 3 seconds after heavy dose of starting fluid. Removed spark plugs one and two, appeared dry. I've cranked a LOT (raw water intake off) and figure if fuel was getting there they should be wet.
Now it's replace fuel pump and oil pressure cutoff switch time. I have not identified fuel pump (or removed it), doesn't look like what I've seen recommended, and for sale. I'd like a "remove and replace," thought some here could ID this fuel pump and recommend a new one. (never hear clicking when ignition is on) I don't know anything about the oil pressure cutoff switch, never had one before. Should replace that too? I understand it has a fuse, don't see one nearby and don't know where else to look.
Anyone recognize the old fuel pump and oil cutoff switch and can recommend an easy remove and replacement for each? Pretty sure Moyer Marine catalog is just right, want to confirm. Ever seen this red crud in fuel before? (Tank is OEM under after quarter berth, aluminum, clean and looks like new on exterior.)
Thanks to all for any input, comments or recommendations - the MM forum is an awesome place for A4 talk. This forum (and the reverse gear DVD) taught me everything about the reverse gear 2 years ago - now I hope we can do it again!
First, I found the crud shown in the first image from fuel tank, purged by a primer bulb at location of bulkhead filter. Pumped until it was gone; cannot remove fuel pickup from tank - "head" in pickup is bigger O.D. than bore in welded flange. Purged until no more contaminants. Waited a month for tank to settle, purged, no new "red goo." First attachment is clear plastic container with some fuel, and red goo contaminant. Whatever it is, it doesn't mix with gas. I figure whatever it is might have trashed the fuel pump.
2nd image shows current fuel pump, 3rd image is shot of fuel pump from rear of engine, also showing the oil pressure switch (in yellow "circle"), I think.
I've setup up the fuel line path with and without filter in place, and used priming bulb in-line to pressurize and prime line in all trials until bulb stayed solid. No start - with starting fluid, I get a burst of cranking speed, a few pops, started once for approx. 3 seconds after heavy dose of starting fluid. Removed spark plugs one and two, appeared dry. I've cranked a LOT (raw water intake off) and figure if fuel was getting there they should be wet.
Now it's replace fuel pump and oil pressure cutoff switch time. I have not identified fuel pump (or removed it), doesn't look like what I've seen recommended, and for sale. I'd like a "remove and replace," thought some here could ID this fuel pump and recommend a new one. (never hear clicking when ignition is on) I don't know anything about the oil pressure cutoff switch, never had one before. Should replace that too? I understand it has a fuse, don't see one nearby and don't know where else to look.
Anyone recognize the old fuel pump and oil cutoff switch and can recommend an easy remove and replacement for each? Pretty sure Moyer Marine catalog is just right, want to confirm. Ever seen this red crud in fuel before? (Tank is OEM under after quarter berth, aluminum, clean and looks like new on exterior.)
Thanks to all for any input, comments or recommendations - the MM forum is an awesome place for A4 talk. This forum (and the reverse gear DVD) taught me everything about the reverse gear 2 years ago - now I hope we can do it again!
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