87 camaro -littlr or no fuel pressure after replacing pump

[wrightz28]

Ok then, something is not adding up here.

Where did the pump come from?

Did you double check and make sure you connected the pump to the wiring harnesss and that the ground wire is clean and secure?

[m0t0r]

by restricting the return line and the pressure going up what would be the problem?

[wrightz28]

Originally Posted by wrightz28

Your problem lies elsewhere, probably the regulator, which is normally replaced with the pump hand in hand anyway. Do as HotZ28 has already suggested, pinch the return line and see if pressure increases.

Dejavu

[Blue Bowtie]

First, the hose section between the pump and steel tube is a "pulsation damper" unless you were aware of the problems with those and installed a section of regular fuel line hose there instead. Those swell, soften, and split very frequently.

Second, restricting the fuel return line will reveal any possible problems with the pressure regulator leaking through. If pressure is low but increases when the fuel return line is pinched closed, the regulator is probably leaking internally.

Third, you need to get the pump to run before you can test fuel pressure. The pump should run for a two-second prime cycle whenever the ignition is turned on. The ignition will need to be turned off for at least 20 seconds before the pump will run a two-second prime cycle again on ignition power-up. You can also remove the fuel pump relay and jumper the main power connections to run the pump continuously for diagnosis, or supply a separate 12V sounce to the "G" terminal on the ALDL connector to power the pump. However, applying power to the "G" terminal requires having a good relay installed, since power will have to route through the normally closed contacts of the pump relay to reach the pump.