{"id":790,"date":"2009-01-02T13:21:49","date_gmt":"2009-01-02T13:21:49","guid":{"rendered":"http:\/\/www.n5hrk.com\/blog\/?p=790"},"modified":"2018-08-10T15:47:46","modified_gmt":"2018-08-10T20:47:46","slug":"when-debris-attacks","status":"publish","type":"post","link":"http:\/\/www.n5hrk.com\/blog\/mega-squirt-efi\/xj550\/when-debris-attacks\/","title":{"rendered":"When Debris Attacks!"},"content":{"rendered":"

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I had a few minutes at lunch to troubleshoot the fuel pump issue. I unplugged the fuel pump and put the meter on the harness. Key on, no juice. I pulled the seat off and checked the fuse. The 10A I’d installed while I was in the parking lot down the street was still in place and not blown. I checked the hot side of it and found no juice there, either. I pulled the relay from it’s socket and the battery side of it had no juice. I traced that down and found an inline fuse holder I’d forgotten was there! The 10A fuse in it was blown.<\/p>\n

I replaced that one, put a 5A back in the fuel pump fuse holder and verified that I had power to the connector. I turned the key off, plugged in the connector, turned the key on and SNAP! The 5A blew with considerable alacrity.<\/p>\n

The coil on the motor reads a pretty normal 1.5 ohms, so my second theory that some debris has jammed the impeller seems likely. Stall current would be about 8A.<\/p>\n

I have looked around… A fuel pump from a local bike salvage yard (which moved across town, much closer to me now!) is still a bit high. The one model he has several of and thus charges the least for is still $150. I can get them all day on eBay for half or less of that, but I can’t just walk into eBay and pick one up….<\/p>\n

Before I purchase one, I will pull the pump out and see if I am lucky enough for the debris to be lodged in the back of the pump where it can be removed or flushed backward or something before replacing it..<\/p>\n

In related news, it occurs to me that I may be able to use these throttle bodies for a while longer by lowering the fuel pressure a bit, delivering less fuel, thus perhaps get a leaner minimum mixture. As it stands, at idle the injectors are opening for what is just about as short a period as possible and it’s delivering too much fuel. The regulator I have is the hard set unit that came with my salvage fuel pump. It appears to be set to about 43 psi, which is pretty much normal. I ordered an adjustable regulator which will run 0 – 100 psi. I think I am going to try about 35 or so to start with.<\/p>\n

\"\"<\/a><\/p>\n

While I’m doing all this fuel system work, I think I will wire in that tilt disconnect switch that I’d forgotten about… \":)\" And since I forgot about the other inline fuse holder between the battery and the relay, I will update the wiring diagram, too.<\/p>\n","protected":false},"excerpt":{"rendered":"

  I had a few minutes at lunch to troubleshoot the fuel pump issue. I unplugged the fuel pump and put the meter on the harness. Key on, no juice. I pulled the seat off and checked the fuse. The 10A I’d installed while I was in the parking lot down the street was still … Continue reading When Debris Attacks!<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-790","post","type-post","status-publish","format-standard","hentry","category-xj550"],"_links":{"self":[{"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/posts\/790","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/comments?post=790"}],"version-history":[{"count":3,"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/posts\/790\/revisions"}],"predecessor-version":[{"id":1794,"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/posts\/790\/revisions\/1794"}],"wp:attachment":[{"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/media?parent=790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/categories?post=790"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.n5hrk.com\/blog\/wp-json\/wp\/v2\/tags?post=790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}