Fuel Pump question

T

TeRRa4

Member
Hi everyone!

So the 3500S I'm picking up tomorrow is currently sort of suffering from a fuel starvation issue, as far as I can tell. The replacement electric fuel pump (because the mechanical one completely died) isn't providing enough fuel to the engine when in use for long periods.

My question is simple:
What electric fuel pumps (positioned in the engine bay) are you guys using? Hopefully the one in the car at the moment will get me home tomorrow. If not, I'll be making use of my cheap breakdown cover!

Thanks in advance!
 
TeRRa4 wrote
The replacement electric fuel pump (because the mechanical one completely died) isn't providing enough fuel to the engine when in use for long periods.
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There are two different designs of electric fuel pumps, those that pull the fuel through and those that push. Using either in the wrong location will deliver a less than satisfactory outcome, which may well explain the above.

Ron.
 
i havent used one myself. basically it has to be a puller with pressure low enough for the carb. worth putting HUCO into the search box at the top and seeing what pops up...

Rich
 
I have a HUCO in mine and back when it was on the road in Cape Town's summers it never gave fuelling problems
and that was in temperatures up to the occasional low 40's Celsius.
 
Thanks for the advice, but that's a slightly different scenario to mine. Mine already has an electric pump on it (the mechanical one broke a while back) but it's as if it's not powerful enough, despite having a rating of 4.5psi.

Huco seems to be the pump of choice, so I'll do more research into that.
 
I have a Huco. It is important you mount it well otherwise it's annoyingly noisy.

I'd also check the levels in your float chambers and any fuel filters for partial blockage. It's not impossible that changing the pump could have disturbed something.

4.5PSI is borderline too high. That is for US 4 barrel carbs, webbers and similar. You need around 1.5-3 psi for SUs from what I've read.
 
PeterZRH said:
I have a Huco. It is important you mount it well otherwise it's annoyingly noisy.

I'd also check the levels in your float chambers.
Click to expand...
Could you send me a link to the pump you got, or is this one correct? http://www.ebay.co.uk/itm/360758769989? ... EBIDX%3AIT

Yeah, that's the only other thing I think it could be. The current owner did have a mechanic have a look at it all and he said he couldn't work it out, so I'm assuming the pump isn't good enough.
 
It came with the car I'll get the model number from it over the weekend. It has a black plastic body and a mounting ring. You need to add some rubber like a soft exhaust mount under that. It's surprisingly heavy for a plastic body so I'm assuming the points and mechanism are fairly beefy internally.

Seems to work fine although mine is wired wrong currently and also operates on the accessory position.

I'd also recommend you fit an inertia switch for safety. These can be had for under a tenner (I have a land rover discovery one) and simply fit inline to the power feed and its best attached to your bulkhead.

You really don't want to keep pumping gas should you have a mishap, I was quite impressed at the volume this delivers when I hotwired it to pump out the fuel in my tank. It can fill a pint jar in about 5 seconds...
 
Yep. It looks like that. But then they all do. I'll need to check the one I have.

Note also how low the pressure is.....
 
Excellent! Nice to know I'm on the right track then.

I'm collecting the Rover later today ('excited' doesn't cover it) so if it dies on the way home I'll order that and hopefully try to fit it early next week.

A switch for it does sound like a good idea, actually! I'll look into it. Thank you very much! :D
 
Update: It did die on the way home, but only after I got stuck in traffic on the M25 (manage to ditch it on the hard shoulder as soon as I noticed it was struggling). It's something to do with the pump and idling for long periods of time. Going to run more tests this weekend and see what happens. If it dies again, I'll be ordering that new pump.
 
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