keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 24, 2017 10:45:14 GMT
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Hey guys
Currently got a su hif44 on my Suzuki sj(vitara 1.6 8v engine), which is fed by a low pressure facet pump
Pottering about it seems fine, but when I've got the foot down, it starts to splitter and I get no revs at all, it will then cut out, but will start again on the push button
The carb was overhauled and rebuilt using the correct spring and jet recommended on the sj forum, which leads me to ask, could it be the fuel pump causing these issues, or does it sound more like the carb needs properly tuned?
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ChasR
RR Helper
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Posts: 10,307
Club RR Member Number: 170
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Oct 24, 2017 11:57:45 GMT
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Which model of Facet is it fed by and how old is it?
If it were me I'd buy an SU specific pump. I've never had an issue with an SU pump, but they may be seen as pricey. I undertand many have been fine with the alternative type SU pumps which are widely available for around £30-40. They also self regulate and work to the pressure designed for SUs, something most Facets are a little over.
Have you checked the pressure of your fuel pump as well as the flow rate?
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 24, 2017 14:17:26 GMT
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Which model of Facet is it fed by and how old is it? If it were me I'd buy an SU specific pump. I've never had an issue with an SU pump, but they may be seen as pricey. I undertand many have been fine with the alternative type SU pumps which are widely available for around £30-40. They also self regulate and work to the pressure designed for SUs, something most Facets are a little over. Have you checked the pressure of your fuel pump as well as the flow rate? I'd need to check what model it is, but I dare say it's a few years old now! I got it as a freebie from a friend that used to have it on a stock car I had been looking at su pumps today, and wondered if they would be a noticeable difference when ran with an su carb... That was another thing I was going to ask, if a fuel pressure gauge was worth a buy? |
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ChasR
RR Helper
motivation
Posts: 10,307
Club RR Member Number: 170
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Oct 24, 2017 14:33:16 GMT
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If you buy a pump that's designed to work with an SU carb then no ; I've never needed one.
Some have with some aftermarket version, well an FPR like a Malpassi Filter King.
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 24, 2017 18:29:56 GMT
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I’ll look into the FPR you’ve mentioned
I’ll maybe look into a new pump too, with this one having not cost me anything anyway
I always wonder as well if the facet one I got for free is designed to be mounted in the engine bay rather than just above the tank, where I have it currently!
Some investigation to do once I’m home from work I think
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Midas
Part of things
Posts: 515
Club RR Member Number: 14
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Oct 24, 2017 18:45:00 GMT
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I use a square Facet pump with a HIF44 and use a Malpassi FilterKing set at 3psi so I'm not stressing the float valve. Works fine and fixed the vaporisation problems I was having a treat.
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Oct 24, 2017 19:27:55 GMT
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Where is the pump mounted and what model is it, some have to be mounted lower than the tank to work properly also what pressure is it working at?
*EDIT*... sorry just read your other reply, maybe a pic of the pump will give someone a clue as to what type it is.
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Last Edit: Oct 24, 2017 19:30:24 GMT by Deleted
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 24, 2017 19:56:35 GMT
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I use a square Facet pump with a HIF44 and use a Malpassi FilterKing set at 3psi so I'm not stressing the float valve. Works fine and fixed the vaporisation problems I was having a treat. Definitely sounds like it’s worth looking into the FilterKing filter and regulator then, I’ll check a few basic things once I get back from work and then get one ordered I think! Thanks dude! |
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 24, 2017 20:04:07 GMT
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Where is the pump mounted and what model is it, some have to be mounted lower than the tank to work properly also what pressure is it working at? *EDIT*... sorry just read your other reply, maybe a pic of the pump will give someone a clue as to what type it is. I’m offshore at the moment so can’t grab a pic, but it looks similar to the one below  Cheers |
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Oct 24, 2017 20:44:13 GMT
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That looks very much like an on the bulk head type.
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 24, 2017 20:48:40 GMT
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That looks very much like an on the bulk head type. That being the case, it could well explain the issues I’m having then |
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Midas
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Posts: 515
Club RR Member Number: 14
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Oct 24, 2017 22:04:28 GMT
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Probably a little OTT for a SU, those beasties are more often seen feeding twin Webers. I'd definitely have a regulator on there.
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ChasR
RR Helper
motivation
Posts: 10,307
Club RR Member Number: 170
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Oct 24, 2017 22:12:11 GMT
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My one of those was working but weak. When I pulled it out of storage it was broken completely. Is yours Gold?
If it is working it would certainly need an FPR on it as suggested.
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Oct 24, 2017 22:12:48 GMT
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I've had those feeding twin SU's without a problem, his issue is starvation not over fuelling that said I do prefer using a Morris minor pump with twin SU's. (1500/1850 engines) AUA66 type pump.
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Last Edit: Oct 24, 2017 22:15:13 GMT by Deleted
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Probably a little OTT for a SU, those beasties are more often seen feeding twin Webers. I'd definitely have a regulator on there. My one of those was working but weak. When I pulled it out of storage it was broken completely. Is yours Gold? If it is working it would certainly need an FPR on it as suggested. I’m sure it is gold. So assuming it’s working correctly it does needs a regulator, however if it’s not working correctly or is mounted at the wrong end of the carthen that could explain the starvation at higher revs? I've had those feeding twin SU's without a problem, his issue is starvation not over fuelling that said I do prefer using a Morris minor pump with twin SU's. (1500/1850 engines) AUA66 type pump. What pump would you recommend for feeding a single su? And what sort of fuel pressure should I have the regulator set at? |
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ChasR
RR Helper
motivation
Posts: 10,307
Club RR Member Number: 170
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@1300's Dolly's suggestion the same as mine ; to get an SU derived pump. I'll see if I can dig out a link. The main reasons are:
-They are designed to work with SUs and their lower pressures.
-The above eliminates the need for a regulator in most cases
-They are only really audible when they do not have a head of fuel. Otherwise you can barely tell that they are there.
I had a Stag version which even managed to work fine with my Holley 4 Barrel on the Stag.
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 25, 2017 11:55:59 GMT
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@1300's Dolly's suggestion the same as mine ; to get an SU derived pump. I'll see if I can dig out a link. The main reasons are: -They are designed to work with SUs and their lower pressures. -The above eliminates the need for a regulator in most cases -They are only really audible when they do not have a head of fuel. Otherwise you can barely tell that they are there. I had a Stag version which even managed to work fine with my Holley 4 Barrel on the Stag. That sounds the way to go, when it will also save me the money of buying a fpr I’ll have a look on google, but if you have a link for one that would be awesome! Cheers  |
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Oct 25, 2017 14:37:24 GMT
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Hi, A number of members on the Classic Rover forum use Huco 13 3010 pumps an SU derivative, can move enough fuel to supply the V8 but a low enough pressure to not overcome the float valve. The same as the SU some are pullers and some pushers. www.gowerlee.dircon.co.uk/HUCO.html Colin |
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 25, 2017 17:59:18 GMT
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Hi, A number of members on the Classic Rover forum use Huco 13 3010 pumps an SU derivative, can move enough fuel to supply the V8 but a low enough pressure to not overcome the float valve. The same as the SU some are pullers and some pushers. www.gowerlee.dircon.co.uk/HUCO.html Colin I’ll drop them an email, cheers! |
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Oct 25, 2017 18:23:51 GMT
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Before I order one, does anyone have any pros or cons to using engine bay mounted or near tank mounted?
The current one is mounted on the chassis near the tank, but I’m starting to wonder if having it higher up in the engine bay would be more beneficial for when I start taking it off-road again?
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