Hi I've got a replacement type fuel pump running off the cam and a SUmmit liquid filled fuel gauge mounted on a Spectre fuel rail going to my Edelbrock 1806 avs carb. How can I tell my true fuel pressure after warming up and sitting at idle the needle moves (bounces?) from 2.5 - 3.5 I guess the average would by 3 psi but I don't know. Also after running for a longer time the psi apparently goes down to 1.5 or so. Is my fuel pump going bad or am I reading the gauge wrong? If my pump is ging bad what would you suggest, Better quality mechanical or electric with a regulator?
Thanks

 

Sounds like the pump is getting weak. Replace it with either a good quality stock replacement, or the Carter M6626.

 

Well, I don't know if this your problem but I had the same problem. I have a Stewert Warner elect fuel pressure gauge mounted in my car for my NOS system. I installed the sending unit just before the carb fuel inlet. I thought my fuel pump was going south so I did a pressure and capacity test (fuel pump tester) and everything checked out. So I removed the sending unit from the fuel line and noticed that the small hole in the unit was leaking gas. I shook the unit for quite awaile trying to remove the fuel. When I had all the fuel removed I reinstalled the unit, fired the engine and had 5# pressure. I think that the sending unit works on pressurized air rather then solid fuel. My sending unit is mounted on its side so I think that is the problem. It should be mounted upright to prevent fuel from entering the sending unit. Anyhow that is what worked for me.

Auggie

 

oh well cant expect to much from a 20 dollar pump. anyway do you think i will need a pressure regulator after the pump since i've read that the Edelbrock carbs seem to by picky about fuel pressure?

 

Buy a fuel pump tester and and do the tests. It is real simple and you might learn something. Not a good idea to just throw parts at a problem. I have a stock L69 pump and it puts out 3 to 6# all the time. Paid $27 at NAPA.

Auggie

 

I think I still have a return style carter pump around I was going to use it and decided to use my cv pump since it is rebuildable and use a return style regulator instead. I can check tomorrow if you are interested. If I still have it $20 and shipping it's yours

 

I wouldn't go that far. I've never had any problem with the Carter, or the stock AC replacement that preceeded it.

Shouldn't need a reg. I don't read everything available about Edelbrock carbs, but I've never seen that they're sensitive to fuel pressure.