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| fuel pump HELP needed https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=13221 |
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| Author: | TX H210SS [ Sun Jul 20, 2014 11:31 pm ] |
| Post subject: | fuel pump HELP needed |
My fuel pump started to whine and gave up the ghost on my maiden voyage a couple weeks ago. Whine was load and then it shut down. Would start and run for short time and we limped back in. The pump quit whining and working altogether. I just installed new complete fuel cell, removed and cleaned fuel regulator which had about 15% blockage on screen with the black paint from old fuel cell. Filled the fuel filter, purged lines, clean regulator screen and reinstalled and started right up but running rough. The low pressure was at 20psi which is way high. I shut down and checked high side and it pegged the 100 psi guage. I shut it down. Pulled regulatator again and removed screen to ensure nothing on back side. There wasn't...reinstalled and started to check again and high side was now 50 on the nose and ran smooth. I checked low side and it was around 18ish, which is still high but high side remained at 50, which is very good. Now what? What could cause low side running high being high side corrected itself I assume. Does regulator influence low side too when high side is spot on? I assume antisyphon is working since fuel is flowing and high side is correct. Any thoughts? |
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| Author: | 204Angler [ Sat Jul 26, 2014 9:10 pm ] |
| Post subject: | Re: fuel pump HELP needed |
I don't know much about your set up but no one else has replied. You sure the anti-syphon valve is functioning? Think there is a restriction in FPR itself (even after two cleanings?) Maybe a restriction down stream that is causing fuel pump to increase pressure that is overcome when demand increases? That's a tricky one. I hope someone that knows something can help |
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| Author: | crossram [ Sun Jul 27, 2014 10:34 am ] |
| Post subject: | Re: fuel pump HELP needed |
check your vent tube and screen not sure how yours is set up but if not venting right could increase the return pressure . i was having a carb issue after running for a short time i would loose rpms ended up i had a small blockage in the vent .tank was not venting and causing a suction blew tube out and cleaned out the screens |
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| Author: | TX H210SS [ Sun Jul 27, 2014 10:07 pm ] |
| Post subject: | Re: fuel pump HELP needed |
I had removed the fuel cap thinking if it was venting issue that would correct it and tell me the answer...no luck I removed the screen and threw it away, replacing it with the clip as instructed in the Volvo Pentagon service bulletin. I also blew out the vacuum tube at the fuel regulator too. The low side is 17 and high side 52. Both running cool to touch. I am at a total loss as to why the low pressure pump is reading high being the high pressure is spot on and rail pressure is 52. Would anitsyphon valve cause this? Obviously the high pressure pump is causing feedback to low side being it is at correct pressure. Is 18 too high...from articles I read it should be at around 8. |
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| Author: | TX H210SS [ Sun Jul 27, 2014 10:07 pm ] |
| Post subject: | Re: fuel pump HELP needed |
I had removed the fuel cap thinking if it was venting issue that would correct it and tell me the answer...no luck I removed the screen and threw it away, replacing it with the clip as instructed in the Volvo Penta service bulletin. I also blew out the vacuum tube at the fuel regulator too. The low side is 17 and high side 52. Both running cool to touch. I am at a total loss as to why the low pressure pump is reading high being the high pressure is spot on and rail pressure is 52. Would anitsyphon valve cause this? Obviously the high pressure pump is causing feedback to low side being it is at correct pressure. Is 18 too high...from articles I read it should be at around 8. |
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