fuel pressure problem

ERLYBRONCKILLER · Oct 28, 2008

I have been plagued with this fuel pressure problem since I bought my Bronco and would like some suggestions. I start my bronco and it has 7-8 psi at the carb. When I run it for about 10 min it startes droping to about 3 then eventually 0. I have a new edelbrock manual fuel pump. I though it may be the vent on the cap but removed cap and nothing. I rerouted all my fuel lines and wrapped them in insulation. I also put a phinalic spacer under the carb. I don't have a fan shroud though. I don't know if that is causing the engine to get to hot. My temp guage reads fine but I am not sure it is reading correct. I am going to remove the fan and put an electric fan a sensor on to see if that helps. If anyone has had this problem or thinks they know what it is please let me know.
Thanks,
Mike

garberz · Oct 28, 2008

There has been a few post on here about Edelbrock mech. fuel pumps. Numerous problems and so on. I would put in a stock fuel pump, to rule out having a faulty pump. Or temp in an electric one and bypass the mech. Start your diagnosis with the pump.

oleguy74 · Oct 28, 2008

you do need a shroud.

zeeman1 · Oct 28, 2008

Not sure if this will help much, but I'd swap out the fuel filter while I'm at it just to eliminate any doubts, plus it's just a good idea. For some reason when I have a fuel issue that always is the first thing I check.

ERLYBRONCKILLER · Oct 28, 2008

zeeman1 said:
Not sure if this will help much, but I'd swap out the fuel filter while I'm at it just to eliminate any doubts, plus it's just a good idea. For some reason when I have a fuel issue that always is the first thing I check.

Done that and even tried running it with out one. Same problem.

zeeman1 · Oct 28, 2008

If you shut it down after your pressure drops, and start it back up, are you back to normal pressure, or is is still really low?

70_Steve · Oct 28, 2008

I have seen fuel line collapse inside and block fuel flow, while looking OK on the outside. Check and/or replace all flexable fuel line.

ERLYBRONCKILLER · Oct 28, 2008

The pressur is still low after start up again. I haven't though about the fuel line collapsing. I can't remember but I think I replaced most of the rubber lines but I will double check. I think I am going to get an electric pump and bypass the manual and see how that does.

DonsBolt · Oct 28, 2008

garberz said:
There has been a few post on here about Edelbrock mech. fuel pumps. Numerous problems and so on. I would put in a stock fuel pump, to rule out having a faulty pump. Or temp in an electric one and bypass the mech. Start your diagnosis with the pump.

I agree before you dump a whole lot of money and agrivation for a electric fuel pump, or a electric fan get rid of the edelbrook fuel pump, and get one of these

http://store.summitracing.com/partd...908331+4294840126+4294891547+115&autoview=sku

You don't have to get it from summit, as pretty much any local place will be able to get one for you.

I have run Holley and Eldelbrock mechanical fuel pumps, and the carters just work better

bronko69er · Oct 29, 2008

Just for kicks, take off your gas cap(s) and try again.

gjrock · Oct 29, 2008

I thought 7-8 psi at the carb was a little much.

fuel pressure problem

ERLYBRONCKILLER

Jr. Member

garberz

Bronco Influencer

oleguy74

Bronco Guru

zeeman1

Bronco Guru

ERLYBRONCKILLER

Jr. Member

zeeman1

Bronco Guru

70_Steve

Old Guy

ERLYBRONCKILLER

Jr. Member

DonsBolt

Bronco Guru

bronko69er

EB Addict

gjrock

Bronco Guru

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