sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
|
Modifying a fuel tank for efisowen
@sowen
Club Retro Rides Member 24
|
|
|
On my Rover P6 which I've converted to run Megasquirt efi I want to change it from a low pressure pump feeding a swirl pot and high pressure pump to a single high pressure pump fed direct from the fuel tank. The tank itself is very wide, almost cylindrical in a way and sits widthways above the back axle between the bot and the back seat. My idea is to attach two large gravity feeds to each side and run them downwards, probably about 12" vertically to a sump/reservoir which has a single feed to the high pressure pump, is this a good idea or is it incredibly flawed?  I'd rather not go around welding the tank as internally the plating is still spot on (a rarity) and in my mind cutting an access hole in the top and sealing in a pair of AN8 hose fittings to the bottom is a quick, simple, and possibly workable solution. Any ideas/opinions? |
| |
|
|
|
|
Kieran
Posted a lot
Posts: 1,092
|
|
|
|
|
One thought that springs to mind is the lack of internal baffling could lead to one outlet sucking air under hard cornering / low tank levels.
Could you not just use one outlet (plus return) and just mount the tank on a slight angle, towards the outlet?
|
| |
Last Edit: Apr 26, 2016 7:36:14 GMT by Kieran
The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
|
|
sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
|
Modifying a fuel tank for efisowen
@sowen
Club Retro Rides Member 24
|
|
|
One thought that springs to mind is the lack of internal baffling could lead to one outlet sucking air under hard cornering / low tank levels. Could you not just use one outlet (plus return) and just mount the tank on a slight angle, towards the outlet? I could fit some baffles, to fit the outlets without welding I'd need to cut a hole in the top and fit an access plate which I could drop the baffles in from. The tank fits the hole it sits in perfectly, they slide in and are clamped in place. My thinking was that two outlets feeding a remote reservoir 12" lower than the base should prevent air being sucked through even under low level and cornering when one outlet could suck air above the main feed to the pump? |
| |
|
|
froggy
Posted a lot
Posts: 1,099
|
|
Apr 26, 2016 11:56:31 GMT
|
|
Sounds like a good plan , I have two Bosch 44.s fed through filters direct from the bottom of the tank facing back wards as mines mid mounted so they can't starve and works a treat ,
Return line fed into the pot and is say it's a winner
|
| |
|
|
sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
|
Modifying a fuel tank for efisowen
@sowen
Club Retro Rides Member 24
|
Apr 26, 2016 15:50:02 GMT
|
Sounds like a good plan , I have two Bosch 44.s fed through filters direct from the bottom of the tank facing back wards as mines mid mounted so they can't starve and works a treat , Return line fed into the pot and is say it's a winner Sounds promising  I guess I could make a small swirl pot to fit somewhere under the rear, return from the engine to create a swirl and then another return from the centre back to the tank, or keep it simple and have a return from the engine direct to the tank? |
| |
|
|
|
|
|
Apr 26, 2016 17:46:24 GMT
|
I'm running efi without a swirl pot you can hear when fuel is getting low so I just top it up again,I was worried about it stalling on corners but it don't.  |
| |
Last Edit: Apr 26, 2016 17:48:10 GMT by Maizetina
1961 FORD POPULAR 100e
2.0 dohc
Mk1 2dr Ford cortina
|
|
froggy
Posted a lot
Posts: 1,099
|
|
Apr 26, 2016 21:57:16 GMT
|
|
Send the return into the pot so any excess will be pushed back up the supply pipes into the tank and the pot will be always full . 2 litres is a decent size
|
| |
|
|
sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
|
Modifying a fuel tank for efisowen
@sowen
Club Retro Rides Member 24
|
|
|
I'm running efi without a swirl pot you can hear when fuel is getting low so I just top it up again,I was worried about it stalling on corners but it don't. The standard fuel supply on my Rover is to one side, and in the centre is the axle and driveshaft. I like your setup, nice and simple Send the return into the pot so any excess will be pushed back up the supply pipes into the tank and the pot will be always full . 2 litres is a decent size I'm short on space under the car and don't want anything in a vulnerable position, which is almost the entire underside! I think I'll start off with a small reservoir with just two gravity feeds and an outlet to the pump. If that proves to be an issue I could in theory just make a new swirl pot and run the return line in and out of it instead. |
| |
|
|
|
|
|
Apr 27, 2016 20:22:07 GMT
|
I think it'll work - I have more or less that arrangement on my Vitesse but without the volume pot on the inlet. Admittedly the tank is less surge-prone than yours looks to be. Decent size filter makes an acceptable buffer pot or If you could find one of those Mk2 Golf GTI pump-in-a-swirlpot arrangements, that would work too. You'd want one from an 8v electronic injection model. The K-Jet ones are different, include an accumulator.  Nick |
| |
1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
|
|
froggy
Posted a lot
Posts: 1,099
|
|
Apr 27, 2016 21:21:32 GMT
|
|
Lpg vapour filters are ideal for putting between the tank and pump . A few quid and come in various sizes to suit your pump and tank fittings ,
|
| |
|
|
sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
|
Modifying a fuel tank for efisowen
@sowen
Club Retro Rides Member 24
|
Apr 28, 2016 21:21:54 GMT
|
I think it'll work - I have more or less that arrangement on my Vitesse but without the volume pot on the inlet. Admittedly the tank is less surge-prone than yours looks to be. Decent size filter makes an acceptable buffer pot or If you could find one of those Mk2 Golf GTI pump-in-a-swirlpot arrangements, that would work too. You'd want one from an 8v electronic injection model. The K-Jet ones are different, include an accumulator. Nick A few baffles inside the tank should slow down the fuel sloshing from side to side, and I'd think I'd have to have it practically empty and cornering very hard for a prolonged period of time above that of normal driving to get any air low enough down the feed pipes to possibly cause a problem. That Golf fuel pump swirl pot things looks a bit too big, there really isn't much room left underneath! Lpg vapour filters are ideal for putting between the tank and pump . A few quid and come in various sizes to suit your pump and tank fittings , Just did a quick search for those, I'll bear them in mind. Some of them look like they can be serviced with a new filter element, very interested in that. |
| |
|
|
froggy
Posted a lot
Posts: 1,099
|
|
Apr 30, 2016 19:40:53 GMT
|
|
They're dirt cheap so I change mine every two years
|
| |
|
|
