How much amperage should twin fuel pumps pull?

[4seasons69]

I got my car running yesterday and it's popping the 40amp maxi fuse for the fuel pumps. We put a 50amp in that we had laying around and it ran fine.

The pumps are twin walbro 310lph pumps (Ford gt pumps) with a single power feed. The things I changed this winter is I rewired the sending unit with 10 gauge wire and replaced the strainers on the pumps. I did not use the same strainers that were on there. I used ones that a lot of people on the Ford forums say work well with these pumps and they were in Stock at a local parts store.

Are the new strainers just making the pumps work harder, is it the bigger wiring?

Should I just rock a 50amp fuse or figure out why these pumps are now blowing the fuse. Any input and advice is greatly appreciated!

[Halon]

http://www.autoperformanceengineering.com/html/fpspecs.html

Are they wired in series or parallel?

That link above doesn't show your pump, but it shows their smaller pumps expected amperage draw to at least give you a little bit of an idea.

[4seasons69]

Should be parallel. They have one power feed that splits into two wires. One for each pump. Then they each have their own ground

[JET]

10 gauge wire is pretty small for 2 pumps to run off of. It is fine for a single pump. I would double check all the connections and also put a volt meter on them to see what the voltage is at the pump. Something must be messed up in the wiring to pop a 40 amp fuse, especially at idle.

[Halon]

So according to my link, a 255hp at 13.5V at a base pressure around 45psi, you'd expect about an 8A draw. If you have them wired in parallel, then I'd expect around 16A total draw.

Your pump is different, but still I don't think you should be popping a 40A fuse.

[4seasons69]

10 gauge is small? They were running on 14gauge before and never blew fuses. I will double check all connections. And will double check the voltage at the pumps.

[95talonracer]

Do you have the pumps clamped side by side or do you have a spacer between them?

[4seasons69]

Yeah I agree 40 seems excessive. The alternator was putting out about 14.2 v yesterday

[4seasons69]

Do you have the pumps clamped side by side or do you have a spacer between them?

You know what I'm pretty sure they are side by side with no spacer between them

Edit: I just checked a picture I took of the sending unit when it was out and the pumps are touching. You think that could be the culprit?

[95talonracer]

I have heard of thr electrical current or whatever of 2 pumps right next to eachother fighting eachother so some people have added a simple spacer of some sort beteeen the two. Im not sure if you would just use a rubber or aluminum or what but i think it obly nrrds to be a quarter to half incg thich piece.