Odd fueling problem

[1 Finger Bandit]

The other day the 400 fired and then immediately stopped and wouldnt run again. It would turn over but that was it.

I thought it might have run out of fuel so filled up with 20L of new fuel but still would not start. It smelt of petrol so thought we had fuel ok.

Checked obvious and was getting a spark.

With power on operated flap in afm and no pump running. The relay was clicking in and although merasred 12v at the pump it was "dead"

Hotty came down and we changed pump for a known working one (didnt notice straight away the reversed terminal so for a while we still had no fuel flow) Car fired straight away as before.

Now tried the old pump again off the car by powering it straight from the battery and it pumped fine

Any ideas chaps why a working pump would stall / stop and then come back to life again?

Cheers

Shaun

PS Thanks to Hotty, Tasmindevil,and Wedg1e

[Transmitter Man]

Poor connection on old pump?

If it did not work on the car but worked off of it it sounds like no power feed was reaching said pump.

Phil
420 SEAC

[1 Finger Bandit]

Measured voltage actually on the terminals of pump

[ed_crouch]

Lump of ste in the inlet of the old pump that was dislodged during pump changes. Dun't take much at all to seize those pumps. A grain of sand will do it.

Had it run low on fuel beforehand?

Either way, I'd have to advise a prefilter. www.fuelsystem.co.uk sell em (bullet inline filter), but they arent cheap. On the upside, they are really bling, top quality (fitted one before), and the filter elements are washable and replacable and are cheap.

I would definitely go for SPECIFICALLY a pre-filter as they are low resistance & high flow with very low pressure drop, as required to prevent cavitation at the pump inlet. Most cheapo in-line filters are not really up to the job.

[Solitude]

Agreed, got a bullet myself (Glencoe in staines) as i replaced the swirl pot.
Your pump might just be on its way out as they don't just stop necessarily, they break down steadily, and you've just had the heads up !!

[1 Finger Bandit]

Thanks for advice ed. Tanks have been dry for some time due to rebuild and pump stopped as it neared the empty point. I guess it was some crap then as there was quite a bit of residue when we changed pumps over. I thought the swirl pot has a filter in it but is this for larger crap ? Cheers Shaun

[keatsie]

Agree - fuel pumps fail under load, yours has given you a heads up, time for change..

[ed_crouch]

www.fuelsystem.co.uk again and get something like a TCP020/1, /2, or /3 depending on plumbing. Basically give em a call and discuss. The orginal Bosch pumps arent much cheaper Im afraid... Sure you could get an aftermarket cheaper, but they probably arent much cop.

</miserable git...!>

[1 Finger Bandit]

Who you calling a miserable git

[ed_crouch]

Me for being the prophet of doom!

[1 Finger Bandit]

Never shoot the messenger !