hoppy Posted May 23, 2018 Report Share Posted May 23, 2018 (edited) Last year I fitted new bosch pump conversion, new metering unit (exchange), new injector hoses,new PRV (bought outright no exchange availble), car was EFI but I changed it back to P.I. after ECU melt down. The pump has now started wailing like a banshee, have replaced bosch filter. Could problem be the PRV or is it something else? Car starts OK and runs OK. Any ideas? Thanks, Graham. Edited May 23, 2018 by hoppy Quote Link to post Share on other sites
Rem18 Posted May 23, 2018 Report Share Posted May 23, 2018 (edited) Normally they only go noisy when they are having trouble getting fuel. They last for yonks otherwise. Whats the number on the pump? Edited May 23, 2018 by Rem18 Quote Link to post Share on other sites
hoppy Posted May 23, 2018 Author Report Share Posted May 23, 2018 (edited) I'll have to check the number, unit was supplied from Moss last year. I was thinking that fuelstarvation might have something to do with it, next course of action is to fit a larger diameter hose from the tank to the filter. Thanks for your reply Rem 18 . Edited May 23, 2018 by hoppy Quote Link to post Share on other sites
Rem18 Posted May 23, 2018 Report Share Posted May 23, 2018 Dont go touching things. The fluel flow will only be as fast as the least diameter bit from the tank. Where is the pump situated? Are all hoses good and not restricted? Then disconnect the fuel filter at the pump inlet and see how much fuel pours into your boot hahahah you should have a steady supply. After YOu say you have a Bosch filter presumably after the pump? Try running everything without the filter for a few minutes (after your sure at the fuel flow test you didnt have crud) Tony I'll have to check the number, unit was supplied from Moss last year. I was thinking that fuelstarvation might have something to do with it, next course of action is to fit a larger diameter hose from the tank to the filter. Thanks for your reply Rem 18 . Quote Link to post Share on other sites
hoppy Posted May 23, 2018 Author Report Share Posted May 23, 2018 Pump sited in spare wheel well, new hoses, filter before pump. Disconnected hose at PRV, pump ran quetly with a good flow. Graham. Quote Link to post Share on other sites
Rem18 Posted May 23, 2018 Report Share Posted May 23, 2018 hmmm sounds like a restriction at the return maybe? Someone else who has been there will probably be better at advising you. But bound to be a flow problems Quote Link to post Share on other sites
hoppy Posted May 23, 2018 Author Report Share Posted May 23, 2018 Thanks for your input Rem 18. I'm going to change the feed hose, I can see fuel returning to the tank. I'm pretty sure that you're right about flow probs. Quote Link to post Share on other sites
Rem18 Posted May 23, 2018 Report Share Posted May 23, 2018 Let us know how it goes? Tony Quote Link to post Share on other sites
barkerwilliams Posted May 23, 2018 Report Share Posted May 23, 2018 If it is wailing touch each hose in turn you shoul dbe able to feel the vibration in the culprit. Often steel braided hoses. Â Alan Quote Link to post Share on other sites
hoppy Posted May 23, 2018 Author Report Share Posted May 23, 2018 Will do Allan. Quote Link to post Share on other sites
Mike C Posted May 23, 2018 Report Share Posted May 23, 2018 (edited) I assume the PRV pressure setting has been checked and is correct, otherwise I'd check the suction line and make sure there is an anti resonance loop installed in the PRV return to the tank. Â My PRV is set at 680kPa when tested with air, it works well in my car's system but most people have the PRV set a bit higher. Edited May 24, 2018 by Mike C Quote Link to post Share on other sites
astontr6 Posted May 24, 2018 Report Share Posted May 24, 2018 Last year I fitted new bosch pump conversion, new metering unit (exchange), new injector hoses,new PRV (bought outright no exchange availble), car was EFI but I changed it back to P.I. after ECU melt down. The pump has now started wailing like a banshee, have replaced bosch filter. Could problem be the PRV or is it something else? Car starts OK and runs OK. Any ideas? Thanks, Graham. It can also be the hose from pump to PRV causing harmonic hammering! Some of the suppliers that supply these conversion kits use 1000psi hose, this is always a good recipe to get this noise? The hose s/b as flexible as possible and rated at 150psi working pressure, then you will not get that noise. I always use a rubber type like Gates Barricade. Check that hose out first on your car! Â Bruce. Quote Link to post Share on other sites
john.r.davies Posted May 24, 2018 Report Share Posted May 24, 2018 OR, if it is harmonic, change the length of the hose. Needn't be by much, or alse quite a bit and introduce a loop. JOhn Quote Link to post Share on other sites
Andrew Smith Posted May 24, 2018 Report Share Posted May 24, 2018 Yep, as John says - it's likely to be resonance due to fuel hose length from pump to PRV - try 'resonance' or 'vu-vu zella' in the search facility as there's lots of posts on this subject. Â Cheers Andrew Quote Link to post Share on other sites
Waldi Posted May 24, 2018 Report Share Posted May 24, 2018 There is some good info on the website from Neil Revington. Quote Link to post Share on other sites
colin3511 Posted May 24, 2018 Report Share Posted May 24, 2018 Have you fitted a diaphragm prv? The lucas PRV doesn't like the extra flow from the Bosch type pumps. Quote Link to post Share on other sites
hoppy Posted May 25, 2018 Author Report Share Posted May 25, 2018 The hose from the pump to prv is vibrating, have ordered longer hose that I'll fit next week and let you know the result. Mike C the prv was supplied with the pressure pre-set, if the hose doesn't resolve the issue then I will have to fit a diaphragm prv. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted May 25, 2018 Report Share Posted May 25, 2018 The hose from the pump to prv is vibrating, have ordered longer hose that I'll fit next week and let you know the result. Mike C the prv was supplied with the pressure pre-set, if the hose doesn't resolve the issue then I will have to fit a diaphragm prv. Â Squeeze the hose gently with a pair of pliers. Does it stop the noise? If so consider fitting a clamp around the hose with a bolt trapped in between it and the hose to distort the hose cross section. That worked 25 years ago on a 2.5PI estate with one of KMI's first Bosch pump kits. Peter W Quote Link to post Share on other sites
Tim D. Posted May 31, 2018 Report Share Posted May 31, 2018 On mine I had to fit a new house from the pump to the PRV. this made it buzz. Using a jubilee clip and a bit of lead damped it pretty well but in the end I used a diaphragm prv which sorted it out. Quote Link to post Share on other sites
Rem18 Posted June 1, 2018 Report Share Posted June 1, 2018 Have you fixed this now? I was working on another cars pump today. If you need any assistance with the Bosch Pumpp let me know as I have a lot of information on how to source and which pumps can be used and some easy fixes for these pumps. Tony Quote Link to post Share on other sites
hoppy Posted June 3, 2018 Author Report Share Posted June 3, 2018 (edited) Hi Rem 18 (Tony), I have got a longer hose ready to fit, but haven't had a chance to fit it as yet.(work commitments). Hopefully I will be able to fit it this week, if it doesn't cure the problem I'll fit a diaphragm PRV. I normally fill with super unleaded but this morning I accidentally filled with "normal" unleaded and the wailing has stopped. Will let you know how I get on with the longer hose, Thanks for your help. Edited June 3, 2018 by hoppy Quote Link to post Share on other sites
Mike C Posted June 3, 2018 Report Share Posted June 3, 2018 If your pump suction line is undersized , filling with petrol might have stopped cavitation by imposing higher static head on the pump suction. Quote Link to post Share on other sites
Rem18 Posted June 4, 2018 Report Share Posted June 4, 2018 I have to be honest and say I run with normal most times. How is pump temperature when running, if a Bosch pump is hot its normally due to having trouble getting enough fuel. Good luck. Now if you need or want to change the pump I have a large list of compatibles and there are a lot of non Bosch supstitutes on the market for very small sums now. T Hi Rem 18 (Tony), I have got a longer hose ready to fit, but haven't had a chance to fit it as yet.(work commitments). Hopefully I will be able to fit it this week, if it doesn't cure the problem I'll fit a diaphragm PRV. I normally fill with super unleaded but this morning I accidentally filled with "normal" unleaded and the wailing has stopped. Will let you know how I get on with the longer hose, Thanks for your help. Quote Link to post Share on other sites
John L Posted June 4, 2018 Report Share Posted June 4, 2018 I seemed to have stopped my Bosch pump wailing with a proper CAV filter, the one I took off was from Moss. I took the filter apart, it wasn't dirty, but seemed to have much less paper and thicker construction. I was going to do a flow test through it, but got carried away when I took it off and opened it up see what was inside, anyway the new one seems to be working much better. John Quote Link to post Share on other sites
Rem18 Posted June 4, 2018 Report Share Posted June 4, 2018 John might have a good point although. I use CAV to Bosch and I have never had trouble. Quote Link to post Share on other sites
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