in-tank fuel pump

[cameronfurnival]

Having spent a while now browsing the internet and thumbing my haynes manual I thought "why not ask someone who knows" so here's my question guys...
I have fitted a sierra intank fuel pump and sender combined unit. I have worked out the wiring but am left over with a black/yellow wire? What does it do?
ALso - Im running the 2.0 l engine anyone anticipate any problems with the delivery of this unit? I was told it would be fine.

Many thanks

[keith_h]

Re: in-tank fuel pump

It's almost certain to be for a "tanks low" warning light.

If you are using the Sierra pump what tank are you fitting it in? You will probably have a big enough hole to get inside the tank and fit baffles across it if it hasn't already got them. I didn't and I have always suffered from the engine spluttering if I go round a left hand bend under power with less than a couple of gallons in the tank. I don't know if anyone else has come up with a working design for baffles but I am guessing they need to be about 3" tall with a gap of say 1/4" under the bottom. If you can design them so that you feed them through the hole and then bolt them together such that they are locked in place without having to compromise the tank skin all the better but make sure they are in tight. You don't want any chaffing that will ultimately rub away at the tank from the inside

[chris_cussen]

Re: in-tank fuel pump

Well the Haynes manual is about as useful as a chocolate teapot w.r.t. your wire.

I've a 2.0l DOHC on carbs. The power delivery seems OK, though the engine is a bit 'fluffy' at very low RPM. I put it down to the free flow exhaust and the different air filter. Its not too bad though, you just need a bit of throttle when pulling away. After that the power delivery is quite smooth, and when I get to about 3.5k on full throttle there is a bit much more urge.
Having said that you are talking about 123bhp, and there are some pretty high powered Marlins out there. 0-60 comes in about 8 seconds and I wouldn't like to claim what the top speed is (cos Mr.Plod might get too interested).

I've got the 'standard' Marlin tank, no baffles, and there is a 270 degree bend from a fly over to the A303 where I live. No real fuel pick up problems with a nearly empty tank even when testing the grip around the bend.

If you are using fuel injection with a swirl pot I would think it is unlikely you would have fuel pick up problems.

[Mike]

Re: in-tank fuel pump

Having spent a while now browsing the internet and thumbing my haynes manual I thought "why not ask someone who knows" so here's my question guys...
I have fitted a sierra intank fuel pump and sender combined unit. I have worked out the wiring but am left over with a black/yellow wire? What does it do?
ALso - Im running the 2.0 l engine anyone anticipate any problems with the delivery of this unit? I was told it would be fine.

Many thanks

Don't know what it is, but if it is Black/yellow (not Yellow/black) isn't it likely to be a switched live wire?

[keith_h]

Re: in-tank fuel pump

Hi Chris, my tank is the plain rectangular aluminum box from YKC - no swirl pot , no baffles, no nothing.

Cameron, the other thing that caught me out was ground clearance with the 2.0 DOHC Injection engine. With the recommended 13" wheels I had to cut a hole in the bonnet to allow for the plenum to stick through it and, even after doing that I still catch the sump and more frequently the handbrake cable supports at the back of the tunnel. I published the design,manufacture and fitting of a "power bulge" in the bonnet in a Pitstop years ago (Lose weight I hear you say - if only it were that easy!). You might also want to see if there is a better place to mount the hand brake cable support brackets.

Reminds me of the tale of a little old lady at a local parish meeting concerning speed through the village. She stood up and said "What we want is a hump in the road" to which the chairman replied "It's a very nice offer madam but I fail to see how it will reduce the number of speeding cars"

[cameronfurnival]

Re: in-tank fuel pump

haha

I am currently remaking the engine mounts Keith to raise the engine as much as I can within the bonnet space (which is taller than the roadster one. I also thought that the handbrake cable bracket is quite low too - the cable seems low altogether. I am using 14" wheels and am aiming for 185 or 195 tyres so may get an extra half inch (always useful - ooher). Will see how that goes as it looks a real pain to change.
Mike - I think the black and yellow wire is indeed sw earth I have found a better diagram than the haynes one and it indicates a live into the warning bulb for low fuel then off to the tank and earths through a rheostat in the sender unit. I intend to stick with the escort van unit for now and get an ally one made in due course once (if ever) the thing gets road bound.