Fuel system advice, please?

[661]

I run a twin pump system, one Holley red top on at a time. I have had a pump fail in the past so thought I'd set up 2 in parallel. Each has a Sytec one way valve after the outlet port. Both valves have seized. I was DNS at Snetterton, which was less than enjoyable. My question is, does anyone else have a back up , 2 pump, system or is everyone running just the one?
The system has run fine for 3 seasons, I did use 99 momentum for the first time ever at this meet ( with CVL), usually Shell.
I did notice in quali that the fuel pressure was slightly lower than expected and suspect the valves were starting to stick.

[h20hamelan]

Are they Sytec valves quality, or off-shore junk?

Find a proper valve, Mercedes Audi Volvo something from the 70’s 80’s.

Pierberg is what I am using.

[elans3]

I am using a Mitsuba FP3 pump. Best of the best. Most of the Works Rally Teams used to use them thru the 70's and eighties. The one I'm using now came to me on a 289 Cobra Replica I had in the early 2000's, and was dated around 1990 (new). I have swapped it onto every classic car I've had since then, & has been on my Alfa Giulia now for 7 years. Never failed. I have another as back up in the boot. Never had to use it.

[661]

Are they Sytec valves quality, or off-shore junk?

Find a proper valve, Mercedes Audi Volvo something from the 70’s 80’s.

Pierberg is what I am using.

Well there's a question. I'm thinking they can't be that great. If I just use one pump then I don't need any flow valves and that makes the issue irrelevant. Fuelab seem to do decent ones

[661]

I am using a Mitsuba FP3 pump. Best of the best. Most of the Works Rally Teams used to use them thru the 70's and eighties. The one I'm using now came to me on a 289 Cobra Replica I had in the early 2000's, and was dated around 1990 (new). I have swapped it onto every classic car I've had since then, & has been on my Alfa Giulia now for 7 years. Never failed. I have another as back up in the boot. Never had to use it.

I assume the 'back up in the boot' is not plumbed in, hence no reason for flow valves?
It may be time to trust in one pump.

[rgh0]

I have only ever used one electric pump for 40+ years in my Elan and never had an issue. I have used various types over the years as I have needed increased fuel flow as the power in my competition engines has inceased. I have seen other people using two pumps but the added complexity as in your case can give more problems than it solves especially if it hides the fact that one pump has failed until the second one does.

cheers
Rohan

[tonyabacus]

I agree with Rohan, one pump if properly calculated is more than sufficient
Tony

[h20hamelan]

Solenoid pumps are junk, get a rotary.
Lots of people still on mechanical which is a worthy backup as long as your fuel system can survive